Author's Note

I'm so glad you all like the first two chapters! Thank you all so much! We took a break from the Curtain and Rosemary story this chapter to make a story between Curtain and her older sister Casting.

Further warning, if you are uncomfortable with incest, leave now.

Sisterly Love

Name: Casting Call
Race: Unicorn
Age: 23
Gender: F
Orientation: Bi
Role: Dom
Personality: Cold yet caring, fairly emotionless, strict
Likes: Money, family, business opportunities
Dislikes: Ponies who aren’t employers, being bothered, a lot of things really
Fetishes: Being a dom, when somepony belongs to them, giving pain
Summary: Casting Call is the older sibling of Curtain and, unlike her, was born a mare. Throughout their childhood together, Casting was jealous of Curtain as she had gotten most of the attention from their parents, with her being a performer and all. This lead to a troubled relationship between the two of them and gave her a skewed view of life. Yet, despite all her shortcomings, she loves her family and works as Curtain’s manager, organising her schedule and signing her up for shows across Equestria. Today, she and Curtain have a strong relationship, but often disagree on various things.

A few days had passed since the spa date. Rosemary had left Curtain her number and told her of a few days when her parents would be away from the house and advised her to 'sneak in'. It was still some days yet till this window though, so life had returned to normal. Curtain hadn't heard from Rosemary since.
Her older sister, Casting Call, had been hard at work trying to set Curtain up with more gigs. They'd hit a dry spot recently and she'd been struggling to find her some work. She spent a lot of time in her room that doubled as her office, rarely coming out to do anything fun, her dedication to working was both admirable and worrying sometimes.
It was in the middle of the day and Casting had not seen Curtain since before the spa date. Like any other, she was sat at her messy desk and running through calendars, diaries, and various contact numbers. All floating with the light of magic from her horn. She'd been alone all day.

There was a soft knocking at the door.

Casting sighed and put the diaries down where they were. She ran a hoof through her mane to slightly tidy it. When reaching the door, she took the knob with her magic and opened it. She looked very dreary.

Curtain was at the door with a smile on her face and one hoof hiding behind her. "Hey, sis! Oh wow, been hard at work again?"

"Oh... there you are," she said, only half returning the smile. "I wondered where you'd gotten to. It's been tough trying to find work."

Curtain took a glance at the stance of the room, and Casting herself. "Evidently, and I think it's time you had a break."

"A break?! But you don't have anything lined up. I've been trying to get another meeting with Filthy Rich but he won't return my calls!" she snapped. Then took a few moments and sighed, defeated. She rubbed one of her forelegs and her ears drooped a little "Yeah... actually, you're right, I could use a break..."

Curtain couldn't help but feel guilty at the news of not being able to reschedule with Rich, after all, she cancelled it to go to the spa with Rosemary. She quickly snapped back into reality when Casting agreed that she needed a break. "Exactly! Which is why I planned a little treat for the two of us!"

"Oh? Really?" she seemed a bit perked up, unlike her usual serious demeanour "What did you have in mind? Its been a while since we've done anything together."

"It has indeed, I also needed to make it up for the cancellation with Rich, which is why..." She pulls her hoof from behind her to show what she was holding. "I got us tickets to see a magician! You loved them when you were younger."

She was silent at first, a bit stunned. She took one ticket with her magic and looked it over "A... magician?" she raised an eyebrow. Casting looked at Curtain and several memories returned to her. It made her smile, but something about those memories bugged her, she tried not to let it show.
"Oh! Hah. Yes, that sounds like it'll be good fun. Just like when we were kids huh?"

"Yep! Like that time we went to Las Pegasus and we saw that one guy do the drowning trick! Ugh, what was his name?"

"Sheesh it's been a while..." she scratched her mane in thought "The Magnificent... something. Or was it Incredible? Damn... I'm sure the name will come to me"

"Magicians sure do love their adjectives, don't they?" She laughed.

"The Magnificent Maximillio! I'm sure it was something like that. He did that underwater escape... and those card tricks. He made his assistant disappear!" She started recalling with wonder and seemed a lot happier "Yes, I remember that. We kept trying to do that trick where you pick out a card but we could never figure it out, remember?"

She laughed with semi embarrassment. "Oh yeah! Then we tried to do that cool shuffle but the cards spilled everywhere and dad slipped on one!"

The thought made her cringe with embarrassed, then she laughed. "That's right. I wanted to be a magician or somepony on stage, but it never quite panned out..." she said a bit distantly, then coughed and spoke with her usual serious tone. "So then, when is this show?"

Casting suddenly becoming serious also made Curtain drop her humour as she responded. "Oh, it's tonight at 8." She felt distressed at Casting's change in emotions, did she say something wrong?

"8 o'clock? That's some time then. Come in, i'll show you what i've been working on for you." She turned around and beckoned her over to her messy desk. Her room wasn't very tidy, with some random clothes laying around and an unmade bed. She had a calendar on the wall of some famous stallion posing provocatively.

Curtain looked over her older sister's room, using her magic to tidy it up a little as she followed her. Seeing the calendar with the stallion made her chuckle. "Oh my, he sure is something, huh?" She gestured her head towards the calendar.

"Not your taste, I'm sure." She said, turning and looking at said calendar and then at her. Two of her diaries levitated over and she flicked through them, holding them in the air. "I've got a few clients who are interested in meeting you. It's short notice though, can you make these dates?" she pointed at the ones marked out in the diary. Unfortunately, as if fate were working against her, they were the same date period that Rosemary told Curtain to come over.

Curtain inhaled through gritted teeth at the sight of the date, and her heart and face sank.

Casting tilted her head and stepped a bit closer. She spoke with her usual seriousness, but there was a hint of compassion in her tone, always acting like a protective sister. "What's the matter? Don't tell me you can't make these either."

Curtain began moving her head around, trying to knock some sense into herself. "It's just... I had something planned."

"Something planned.. again?" She looked a bit annoyed. "This isn't like you. I mean, do you have any idea how hard it was to even get a meeting with Filthy Rich? What's gotten into you that’s so important?"

Curtain thought for a moment, but decided to tell her sister the truth, feeling disappointed in herself. "You remember when I was hired for a private show for a Saddle Arabian family?"

"I remember. That was a big deal, Lord L'Stranza was how I've gotten this work lined up for you. What about it?" she eyed her carefully.

Curtain looked away, unable to meet her sister's eyes. "You remember how Lord L'Stranza has a daughter?"

Casting stepped a bit closer, her voice was more serious. "Yes... what about her?"

With each sentence she spoke, Curtain bundled herself up more, too afraid of what Casting would think. "Well... the thing is... on the night of the event... we kinda..." She took a large breath. "Hooked up..."

There was silence. Casting's eyes went wide and her lips tightened to a thin line. A loud slam echoed through the small room as she slammed the two diaries closed and tossed them back to her desk. She then spoke angrily, scolding her like an older sibling or a parent would "What in Celestia's name were you thinking?!"

Curtain instinctively jumped backwards and backed away, now afraid. "I-I don't know! It all happened so fast I just... please don't be mad."

A hoof pointed at Curtain accusingly as Casting spoke, still angry "So that’s the reason you've been skulking around all the time? Do you have any idea what kind of damage her father could do if he found out?! We'd be ruined!"

Curtain was speechless and just stood there, almost falling to the ground, staring up at her sister with fear in her eyes. She was truly terrified.

Upon seeing her younger sister getting so scared, she forced herself to take a few breaths and calm down. She held a hoof to her own horn and closed her eyes, sighing, then moved closer. Her tone was still stern, but not nearly as loud "Is she the one you went to the spa with?" she said more calmly.

Curtain felt much calmer at the change in tone and expression and slightly stood back up. "Y-Yes..." She confirmed, still a little afraid. "After that night, she offered to take me on a spa day."

"After everything I did to get that meeting with Filthy Rich..." she frowned and her lips grew smaller again, making her look very frustrated. Her next question had a very different tone and she asked it carefully "Does she... like you?"

Curtain's eyes widened when the question was asked, but not out of fear, out of shock. She wasn't entirely sure how Rosemary felt. "I... I don't know..."

"And you... you like her?" she stared at her, raising an eyebrow, she was a lot more controlled in her emotions.

"I..." She looked away for a moment, thinking. "Maybe... I'm not entirely sure."

"Enough that you'll drop me for her?" She said surprisingly, but with some bitterness in her voice.

She looked back to Casting "D-Drop you? What do you mean?"

"I do everything to look out for you, keep ponies wanting to see you. I work so hard that I barely get a life of my own." She said, stepping a bit closer. "But I'm not the one on stage, am I? It’s always gotta be about you. You get the fans. You get the attention. You get all the excitement... now you even get the girl!" She said the last part with some bitterness.

Curtain stood there for a few moments, processing what her sister had said, before standing up and moving towards her. "Casting... I'm so sorry. I never knew you felt that way."

"Yes, you did!" she said accusingly. "You must have known. When we grew up I was always jealous that you got all the attention. Surely you saw that? I used to be mean to you because of that. I was so jealous of my younger..." she paused. "F-Forget it..." she forced herself to say, despite obviously wanted to say a lot more. She was clearly very emotional.

Curtain moved closer and placed a hoof on Casting's shoulder. "I... Casting... I'm so, so sorry." She began to tear up. "I... I never thought of it like that."

She took in a sudden breath when she was touched. It was very unusual for Curtain’s older and normally stoic sister to be this emotional. She looked at her again "Y-you're always so..." she leaned in a bit closer, staring at her tearful face, the innocence in her eyes and the strange feeling she had for her. The bond they'd created over the years. Could jealousy like this really break something so strong? Or perhaps it’s what forged in to begin with. Something drove her on. A strange innate feeling that was familiar to her, but she'd always kept buried deep within her, ever since that one particular day...
Her head came closer and she closed her eyes, leaning in so their horns touched and her forehead pressed against Curtain's. She held this and breathed a few times, enjoying the closeness of it all.

Curtain smiled and a single tear left her eye as she wrapped her hoof around Casting, also enjoying the embrace.

There was silence in the room, quiet solitude and a closed sense of intimacy. It was a safe feeling being this close to somepony they'd each know so well. Casting's breaths touched over Curtain’s face. Then, she unexpectedly made a move. Her mouth moved closer and her lips pressed up against those of her younger sister. It was a shocking thing to try, but the hidden emotions within her had taken over and she reacted to them. The soft, warm touch of her lips rubbed onto Curtain's own, for a moment there was no feeling that it was her sister doing this, as the touch was just like that of any other mare.

Curtain embraced the kiss and returned the favour as she began stroking her sister's neck, not fully aware of what was happening.

A moment of clarity took over and Casting's eyes shot open. She instantly pushed Curtain back and stepped away from her. Casting stood there, staring at her, covering her own mouth with one hoof. The tension in the air grew enormously as it settled in to both of them what had just happened.

The sudden push from Casting also brought Curtain back to the present, she stared at her elder sister with shock and confusion. "Did... did that just happen?"

Casting wiped her mouth quickly and tried to get composed. "What am I doing... get with it" she told herself "That shouldn't have happened... dammit. Damn it all to Tartarus" she moved away, sitting on the edge of her bed and causing it to sink a little. She stared at the door. "What am I doing..." She repeated.

Curtain moved over to the space in front of where Casting was sitting and looked at her with more concern than anything else. "Casting? Are you alright?"

"No, I'm not okay. None of this is okay!" she said, looking up at her and sighed, she half looked away and spoke quietly which was unusual for her. "You know I've always had a thing for mares too, right? Maybe you didn't..."

"I had a suspicion..." She looked in the same direction Casting was. "You always seemed to get... upset... when I mentioned how cute a random mare was."

"That's more because..." She sighed again and looked back at her. She chuckled a bit to break the tension "I can't believe i'm saying this... It's because of you. It's always been because of you. Ever since..." She paused again and looked concerned.

Curtain too looked back at her sister, kneeling down on her front legs to look up to her. "B-Because of me? And since when?"

"Ever since you changed" She held a hoof out to her, staring at her eyes and her face while she talked. "When you became who you really are, my younger sister... with that new body. I couldn't see you the same way... but not in a bad way! I started seeing you as the pony I always cared about, only now I had... feelings about you. Feelings that I couldn't ever admit. Nopony should ever admit, its wrong in every sense of the word! But I couldn't help it. I wanted to help your career, look after you, so I could always be close to you." She stopped, the outpouring of her deepest feelings was a lot for her. She rubbed one of her hind legs and her ears flicked around in agitation as she paused.

Curtain stared back at her, her mouth agape and finding it difficult to process what she was hearing. She eventually fixed herself and was able to speak again. "I... I never knew you felt that way..." She felt herself begin to tear up once more as she stood back up to meet her sister's eyes.

"Well, there you have it." She raised her hooves up, but stopped to wipe a tear from her own eye. "I've probably messed it all up now though. All those years I kept it quiet, but then lose it because you hooked up with that rich mare and it made me jealous. I really am a terrible sister, huh?"

"What in Equestria would make you think that?!" She moved closer and placed a hoof under Casting's chin. "You are the best sister I could have ever wished for. Even if you teased me when we were foals, you dedicated your life just to helping mine. I couldn't be more happy." A tear ran down Curtain's face as she continued. "And it's perfectly fine to have these... feelings towards me, I would never, ever judge you for that."

"You really mean all that?" She looked up when Curtain cupped her chin, she was smiling now with immense gratitude in her eyes. She too was a bit tearful, but not as much as her younger sister usually was. Casting reached out toward her, stroking the pink mane behind Curtain's neck while she spoke "You don't think it’s wrong?"

"Of course not, sis!" She chuckled a little and smiled back. "Love is love, no matter race, gender, even relation."

With her hoof caressing Curtain's mane, she smiled at her younger sister and kept strong eye contact. Her stern expression was a lot softer and her eyes still somewhat watery. A surge of relief ran through her body. These feelings she'd kept bottled inside her for so long, all over fear, a fear that had now been washed away. "Curtain..." she said softly and pulled her close.
Casting pressed her cheek up against that of her sister's. She closed her eyes, smelling her neck and mane, taking in the natural scents and the pleasant odour of her conditioners and perfume. The warmth of holding her so close. The feeling of another pony she'd cared so deeply for.

Curtain wrapped her forelegs around her sister as she felt the warmth of her face upon hers, another tear rolling down her face. "I love you, Casting." She said with utmost sincerity.

Casting’s head turned inward and she kissed Curtain on the neck. It stayed there a while so she could feel the hairs and the pulse of her veins, the same bloodline that ran through her. All convention said this was wrong, but the feelings she felt were so right. "I love you too, my baby sister" she replied and stroked her a few times.

Curtain moved her head away from Casting, exposing more of her neck as her sister kissed it. She gave a small groan as she did so.

A pair of hooves wrapped around Curtain and pulled her close, pressing her head against Casting’s body where she sat. She rubbed along her back and shoulders, feeling more like a pair of lovers now. "You're really okay with this, Curtain? I've waited so long to look at you this way."

Curtain replied by tilting her head to the side and giving a sly smile, before thrusting herself forward and kissing her sister, slowly pushing her back against the bed.

She was a little taken aback by this. Her eyes opened wide, but slowly closed afterward. Casting fell compliant to her sisters advances, letting emotion entirely take control now. She ended up on her back. One hoof scooped behind Curtains mane. Her mouth open against hers and her tongue gently going to work. It was a tentative touch at first, but once accustomed to the sensation, she began wrapping her soft tongue along Curtains quite lovingly.

Curtain took her time with her sister. Casting, like Rosemary, had not had much experience with mares, or with anypony really. So she slowly let Casting take control and become the dom, allowing her to take control of how far they went.

Also unlike Rosemary, Casting was a much more restrained kisser. She took her time. Exploring Curtains mouth, rubbing the tip of her tongue against hers, suckling on it. All while hugging her and rubbing her back and sides. It felt much more like a lover. Casting pulled back, breathing over her. Then in a sudden burst she grabbed Curtain tight and rolled her onto the bed, following the movement through so she ended up atop her and looking down. Her magenta mane falling down and a loving smile across her face.

Curtain gave a yelp as she was thrown over, not expecting her older sister to be so forceful so quickly. Though she figured Casting would like to be on top, she didn't expect something so... intimate. Perhaps she was telling the truth about this longing towards her. Curtain gave her sister a smile in response and pretended to struggle slightly, but obviously not wanting to break free.

When laying over her, Casting pinned her down to subdue the struggles. It made her smile. She pressed her body down over hers to get a strong physical connection. Her mouth just inches away. She stroked Curtains cheek as she spoke.
"Well... I've never tried this with another mare before. You know the sort of things I'm into, right?"

She lay for a few moments, remembering Casting's personality and behaviour and trying to determine what she would be into. A single idea burst into her mind and she gasped as she realised it. "Well I'm glad I'm here to help you... mistress."

This seemed to please her a lot. She grinned and leaned in closer. She whispered "I hope you're a good teacher..." and her horn lit up. The bedside drawer opened and something levitated out of it. She kept Curtain’s focus on herself as something moved near her neck. A cold, leathery feeling of a collar wrapped around Curtains neck and pulled a bit tight. It had a ring on the front with a chain leash that lead to a whopping that made its way to Castings grip.
She tugged it to test how well it held.

Curtain shuddered at the feeling of the collar being wrapped around her neck, it was very cold. The tug from her sister made her head lunge forward. "Oh my... you really are quite naughty mistress."

When Curtain followed through from the tug she grinned "good little pet" she said seductively. Casting rose off her, sitting down and pulling Curtain to follow as she started laying backward.

She followed her older sister exactly where she was pulling, obeying her master.

Casting lay back and pulled Curtain so her chin rested on her upper stomach. She took one of Curtain’s hooves and stroked it, the other tightly holding the leash. There was the consent feeling that what they were doing was unacceptable, but her lust always brushed that aside. Her voice was soft "Are you ready for this, my little pet?" She grinned for reassurance.
Curtain looked up at her sister and felt her nerves tingle with excitement. "I'm ready for anything you can throw at me, master."

Casting pushed a hoof down on Curtain’s head indicating her to go lower. She adjusted herself, holding her hind legs further apart. She kept instructing her to go lower until she saw her older sisters prized marehood. It looked almost identical to her own, if she ever got a close look at it. Casting stopped her from trying anything though by putting one of her hind hooves against Curtains chest, blocking her from leaning forward and the chain held tight. The feminine folds out of reach and denied to her. Casting smiled, enjoying the control.

Curtain playfully tugged and pawed at the leash, allowing her sister to enjoy the power she wielded. Once Curtain took sight of her sister's marehood, she moved forward, but was stopped by Casting. She looked up to her master, confused.

Casting pushed down on her lower stomach, forcing the pussy lips to open up and reveal the enticing entrance. She got a great satisfaction out of doing this. It was something deeply forbidden. She stared at Curtain, checking the lust in her eyes. She never thought she'd actually do something like this with a mare, let alone her own younger sister. It had been a secret fantasy of hers for so long. The more they pressed on, the more confident she got about doing it
"That's what you want, huh? Cute little pet." She pushed her hind hoof against Curtains chest, moving her away and to the limit of the chain. She then lifted the leg, so the hoof moved near her mouth and gave her a direct view in between her legs.
"My hooves are so sore from walking all day. Shame I couldn't go to the spa... why don't you clean them for me? Put that mouth to good use."

Without hesitation, Curtain responded. "Yes, master." She began to lick her sister's hoof slowly, tasting a small amount of sweat from her efforts working as well as some stress. She stared into Casting's eyes lustfully as she licked.

It made Casting hum as she watched and enjoyed the pleasant feeling, the domination. Seeing her sister obeying her commands like this was something she'd wanted for many years. For so long she felt she lived in her shadow, that she was killing the strings but never acknowledged in the fact, but here that was all different.
She started rubbing over her exposed clit as she watched her, trying to show it off as a display of superiority and taunt her with it.

As strange as it made Curtain feel, this longing for her sister, she certainly felt it. The show that Casting was giving her, the taunting, it drove her crazy. Yet she didn't stop her licking, although her mind did wander and her eyes now focused on her new goal, Casting's marehood.

"You like that?" She said seductively, but she could've been referring to anything. She tugged on the chain and moved her hind leg so the wet saliva rubbed over Curtain’s cheek.

Curtain rubbed her cheek over Casting's hoof as well as she looked back to her. "Mmm, have I been a good girl?"

She nodded but didn't reply, instead she leant back and moved her hind leg away, as well as lifting her forehoof and resting it on her chest. She let her pussy lips hang open, exposed to her sibling. A vulnerable sensation one should feel to a lover, but their sisterly love equally sufficient. It would give Curtain a feeling of privy to see her sister like this. Considering what kind of reputation they'd have if this were to get out, the level of assumed trust was significant.
So there she lay. Her eyes closed. Relaxed and waiting to get her first feeling of another mare, of her sister.

Curtain gently moved forwards, towards her prize, slowly rubbing her forehooves up her sister's hind legs as she inched closer and closer. The face Casting was giving made Curtain feel very dominant, despite her current situation. Finally, she had made it, her sister's pussy, yet although she felt as if they should just stop here, her lust was much more powerful than that thought. She mimicked what she had first done to Rosemary, and gently breathed outwards, blowing warm air on her prize.

It made her take in a sharp breath and her muscles twinged. One of her fore hooves cupped over Curtain’s that rest on her hind leg and she caressed it, giving them a sense of connection. The tension and excitement made her heart race.

Hearing the reaction from Casting made Curtain grin in delight, she never tired of the sounds of another mare in excitement. With the hoof that Casting had cupped, she gripped into it softly as she said... "Oh master, I haven't even started yet." She breathed out again, this time spreading out the air to the area around her sister's marehood as well.

This time she made a soft moan, her body twitched once more. When she moved her other hoof it caused the chain to make a metallic rustle. With closed eyes and smile she said... Good little pet..." the signs of her excitement grew more visible. Her clit bulged and pushed outward when blown upon. Signs of moisture became more obvious on the sensitive pink flesh as it awaited to be pleasured. A sight that few had ever seen.

Curtain looked back up to meet her sister's eyes. "Thank you master. I'm so glad to be your pet." Still looking into her eyes, Curtain gave a single, long lick of her sister's marehood, slowly going upwards and moving left and right, going over all the bumps and feeling her entire area with her tongue.

This was it, she was finally going to feel it. She bit her lip and made a delightful sound. It made her open her eyes and she got the comforting stare of her sister back at her. There was no turning back now from what they'd become. She kept the leash held firm, moved her other hoof to behind Curtains ear and played with it "What's it like?" She smiled.

There was a part of Curtain who still felt that what they were doing was wrong, that two sisters should never do anything like this. But something about this felt too right. "You taste wonderful master." She smiled back. "May I please have some more?"

It made her break character a moment and laugh, some of the tension was removed at least. "I've had a long day. Finding work for you is very stressful. I could use some unwinding." She tugged on the chain for emphasis.

"Well... when you put it that way..." Curtain said before clamping her mouth down onto her sister's pussy, moving her tongue all around, but not entering just yet. With the hoof that was not being held by Casting, she began rubbing her sister's hind leg.

Some more moans came from the elder sister. She rubbed the top of Curtains head, then the name behind it as she went to work. It was a foreign feeling, but a welcome one.
"So delicate..." She whispered "Do you feel safe with me?"

Curtain stopped her movements and removed her mouth with a pop, taking a moment to examine the work she had done. "Safe? Of course I do, sis."

Her marehood was now entirely moist from the mix of saliva and her own juices, the warmth radiated from it. "That's good. That's all I ever wanted for you." She smiled at her. "Just for you to be safe, to prosper and to be close to you. Let's never change that. You and I against the world."

Curtain returned the smile her sister had given her. "As it always has been. Now, not that I don't appreciate a good sappy moment, but do you think I can continue now?" She joked.

She laughed again and tugged the chain. "Always so impatient, ever since you were a foal." She grinned then relaxed back and closed her eyes. She didn't respond, but pushed her hips up a little.

Curtain gave her sister a face that read 'really?' "Would you prefer I just leave you like this?" She signalled to Casting's pussy, but didn't give her a chance to respond as she went back in, continuing her movements from where she left off.

She shrugged, then started moaning again as Curtain went to work. She'd relaxed a lot more now and accepted the situation. Her hoof pushed Curtain’s head closer to her and she started whispering sweet nothings.

Feeling Casting's hoof push against the back of head, Curtain used her free hoof to find and grab the chain, tugging it, indicating that she wished to be yanked. She was further turned on by her sister's noises and felt herself dampen as she ate Casting out.

Adhering the request, Casting pulled in the chain very hard, enough to break the mouth contact. She stared down at her, getting much more in character "What? This better be good, I want to cum sometime today."

The entire experience was unexpected for Curtain. She did not anticipate being pulled back to her sister's face, with such force, and for her character to be broken. "I-I was just letting you know you could use the chain rather than your hoof to press my head further in."

"You don't like it too rough?" She raised an eyebrow and gauged her over. Relaxed and sighed. "Alright then. Get back to work my little pet." she pointed downward with the chained hoof, making it rustle.

"Oh, you can be as rough as you want, just figured it'd be better to use the leash to pull me further inside." Curtain moved back down and continued her movements once more, this time though, she had had enough, and started inserting her tongue slightly to explore.

She did just so, pulling the chain upward to hold her closer when she pushed inside. The taste was devious and the feeling far more forbidden than even Rosemary was. Casting arched her back slightly at the feeling of the slight penetration. She found her sister much more gentle than the stallions she'd been with. It was a pleasant change of pace. The privacy of it all was a great turn on. Nobody would know of this.

Curtain couldn't help but smile as she was eating out her sister, the noises coming from her were simply too much to bear, and she started to rub her own marehood as her tongue went deeper. The collar provided a pleasant change to the sensation, something about being thrusted forward was so exciting.

"That's it sis..." she whispered through her moans. She pulled the chain tighter and lashed her hips at her mouth. Her head arched back and her moans were more vocal. She was a lot louder than Rosemary, less dignified and more primal. Her hind leg twitched and kicked at the air.

Spurred on from the reactions of her sister, Curtain began to moan into Casting's clit as her tongue continued to explore. The hoof that was pleasuring her own pussy was becoming much more damp.

"K-keep going!" She said in ecstasy. Her moans were louder, loud enough that anyone else in the house would hear, or even those walking too close. She seemed proud of the sounds she made, the pleasure was hers and she owned it. Eventually it reached a peak. She grit her teeth, pulled on the chain hard and her body tensed up as the orgasm came. She was embarrassed for a split second to do this in front of her sister, but the fear faded quickly. She yelled loudly toward the ceiling. Each time getting a little less forceful and more loving and passionate. She was able to naturally squirt but did so only twice before it subsided into a regular female orgasm. Her chest rose and fell from deep, exhausted breaths.

Curtain wasn't expecting such a quick reaction from her sister, as she had barely gotten started, not to mention she wasn't able to get herself off yet. Though she kept licking, lapping up as much of her sister's juices as she could. As she did so, she looked back up towards Casting, her face occasionally blocked off by her own chest as she breathed heavily, making Curtain grin once more. She had done it. She had made her own sister, her own flesh and blood, orgasm.

Casting lay backward, sweating, panting, barely aware of what just happened. She swallowed and her body twitched. The room had become very warm. She felt somewhat in the afterglow as she recognised it was her sister just below her and this was something she was never supposed to see. It took her awhile to speak, she rustled the chain when she did.
"Good job... little pet... I liked that."

Curtain slowly rubbed her hooves up and down her sister's hind legs as she spoke. "Thank you master, it makes me so happy to see you happy." She continued to look into Casting's eyes as she planted soft kisses on her clit, still sensitive from the orgasm.

It made her take a sharp inhale and her leg kicked out. She pulled on the chain instinctively and the clit itself visibly twitched a few times after it was touched. She hummed after, then sat up. She pulled the chain to bring their faces closer.
"Never thought I'd do that in front of my sister someday. Sure you won't make fun of me for the noises I made?" She grinned.

As Curtain was pulled up her sister's body by the chain, her own marehood made a slight trail upwards as it was still very damp from the unfinished hoofing. She replied to Casting. "That wasn't part of the deal, sis." Curtain chuckled.

"Get outta here!" She shoved her playfully. Then pulled her in for another kiss. Like before it was gentle and passionate, spending a lot of time with the tongue and savouring the new tastes. She rubbed Curtains back while they embraced.

Curtain moaned into the kiss, resting her lower half on her sister's as they kissed. She moved her fore-hooves under Casting's neck to lift her head up slightly and started embracing her. Their kiss was very romantic, especially for two sisters.

She moved Curtains mane so it draped down over one side and touched her own chest. The kiss was very prolonged and felt like she'd been wanting this feeling for a while. It took some effort to break it. Her voice was a soft whisper "Well, pet. You want to see my talents now?"

Curtain's eyes opened and her mouth formed a sly grin. "Oh yes master, have I been a good girl?"

"Good enough for a reward I think." She laughed and flicked the chain. "Now get on your stomach."

"Oh thank you master!" Although Curtain felt Casting wasn't really enjoying being called 'master', she couldn't stop herself. She complied to her sister's demand and moved off of her, laying on the bed on her stomach.

"Very good." She watched her dutifully follow her commands and rolled over. She stood up and moved over Curtain. There was a sudden weight as she sat on her younger sister’s back and pulled the chain tight to make her look at her. Her body felt hot and some wetness was evident "Comfy?" She grinned.

Curtain did her best to respond, but it was hard to do with the new weight on her. "Y-Yes master, very."

Her hoof cupped Curtain’s cheek and she smiled, it was a comforting and domineering look. Like you could let yourself lose all control with complete trust. "Always wanted to try this with another mare." She grinned. Her horn lit up and her bedside drawer opened up again. She levitated out a sex toy that resembled a smooth metallic bullet with a golden sheen. She brought it close so they could see it.

"O-Oh my! How long have you had this, master?"

"Years. I don't tell you everything..." she chuckled and stroked Curtain’s mane. She levitated the smooth metal end to her own mouth and wrapped her lips around it, suckling and licking it and putting on a display. Showing the skills she'd developed with stallions.

Curtain's mouth salivated at the sight of it, she never thought she could be so turned on by someone suckling a dildo, let alone her own sister. She watched the display intently, not wanting to take her eyes off it.

It levitated out of her mouth slowly, her eyes half closed and her tongue hanging out a trail of saliva snaked between her and it before breaking. It hovered there, glistening. She smiled down at her, being proud to show off her own oral skills like it was a competition. To her, it sort of was.

Curtain's marehood was now beginning to soak the bed slightly, covering a small area of Casting's sheets in her juices. "M-Master! You're so good!"

"I know." She said confidently with a smirk. "Years of practice". Casting sat more upright now, holding the chain tight. She concentrated and moved the dildo out of sight, behind them. She lowered it and focused only upon moving it. Going below Curtain’s tail, in between her hind legs. It moved closer and soon she'd feel the cool, moist touch of it graze one of her pussy lips as Casting slightly missed the mark.

Despite Casting's miss, Curtain shuddered beneath her as she felt her sister's saliva mix with her pussy juices. "O-Oh! Master, you're so close."

"Dammit. How embarrassing." She chuckled. Then she held the chain tight to get back into character. She focused again and this time found her mark. She slid part of it inside, it's smooth design and all the moisture made it very easy to do so. It wasn't particularly thick either and had a pleasant feeling of penetration without being excessive.

Curtain kicked her right hind-leg instinctively as her pussy was penetrated by her sister's dildo. She wasn't particularly used to such shape and size, but she can't say it didn't do the job. Casting's efforts made Curtain all the hornier. "M-Master! More!"

Casting intentionally made a moan when she penetrated into her younger sister. Her ear flicked a few times at Curtains pleas. She hummed, rubbed the back of Curtains mane and held the chain tight. With concentration she started moving the golden dildo back and forth, soaking it in her own saliva and her sister’s juices. It was intentionally slow at first to taunt her. Always just enough to make her want more speed, more depth.

Unable to do anything other than lay there and accept it, she unhappily did so. "A-Ah! More!" The teasing and taunting from her sister was unbearable, this was torture for her.

"Hmmm..." she stroked Curtain’s mane while sat atop her, smiling and caressing her gently. Casting used her magical control to twist the dildo while it remained half inside. She worked slowly. Too slowly. It was taunting and frustrating, giving only just enough pleasure to make her desperate.

Curtain's hind legs began to flex as the sexual torture continued, she groaned in a way that wasn't in pleasure, but more in impatience and longing. She struggled underneath Casting and demanded more.

"I'm going to remember these sounds." She smiled and pet her again. It solidified her dominant position, both physically and mentally. She tugged on the chain, holding it tight to make Curtain raise her head. Casting then made a small moan herself and as she did so, she pushed it further inside, slowly but surely. Soon it reached its maximum length, the tip prodding at her cervix. Its build solid and notable, but not thick enough to stretch. Each time she tightened and tenses she'd feel it. It was here she held it steady. "That better, little pet?" she said quietly to her.

Curtain shuddered at the sensation of the dildo finally reaching its depth. Though she found it slightly difficult to breathe when being held up by the collar, she found herself slightly enjoying it. More fluids spilled out onto the bed and coated the dildo, but it still wasn't enough. "F-Fuck! More master! Please!"

It began to happen in earnest now. She slid the dildo partially out, then pushed it back inside. Slow and with control. Holding the chain tight, she started grinding onto her back when she did so. Each thrust was met with her hips pushing forward. There was great warmth and some moisture seeping into her coat.

Finally getting some pleasure, Curtain groaned as the dildo began to do its job. She was still unable to move due to the chain and her sister sitting on her, but she struggled nonetheless, allowing Casting to feel the satisfaction of being on top. As her sister began to grind herself on Curtain's back, Curtain could feel the wetness from Casting seep into her fur, making Curtain all the more excited.

"Yes..." she whispered to the struggles and the curtailed pleasure of her sister. She hummed and grinded into her, speeding up the thrusts now. She made her own intentionally exaggerated moans as she did so. The way she grinded she used her hips in a circular motion, giving her the feeling of a mare being the one to penetrate her, much softer and feminine than how a stallion would do. The hoof not holding the chain rested on the back of Curtain's head. She rubbed one of the ears as she grinded on her, looking down to see her twitch and move around beneath her.

Casting could see the face of her sister, the one she had grown up with, in pleasure. Curtain's moans increased in volume as she was now getting excitement from Casting grinding on her. Curtain was close, and she wanted Casting to know it.

"Come on..." she whispered, grinding on her heavily. The hot moisture very evident now. She flicked her mane around, making it go wild as she grinded. The dildo thrusted in her very fast now, her magic making it vibrate with each penetration. "That's it, good girl, let it happen" she said in her soft, but dominant manner.

Curtain allowed it to happen, groaning wildly as she came all over the dildo and the bed beneath her. She made sure to look into Casting's eyes as best she could to see her older sister.

Casting blinked a few times as she watched her younger sister writhe around in pure ecstasy. It was a moment she'd thought about and even fantasized about for a long time, but now seeing it happen she wasn't entirely sure how to take it. Part of it felt morally wrong and she couldn't shake that from her mind. She smiled and slowed her grinds as Curtain's orgasmic waves calmed down. Eventually she sat atop her, panting. There was a deathly silence. She let the chain drop from her hoof and it landed next to Curtain's head. The dildo remained inside but her magical hold of it ceased.

Curtain rolled over so she was on her back, yet motioned that she wished for Casting to stay where she was. Now that the excitement had passed, she too felt... wrong, like this was not something they should have ever done. But she pushed that thought from her mind as she looked up to her big sister sitting on her. Curtain had a smile on her sweaty and panting face as she looked to Casting.

Casting did so. Sitting atop her stomach now. There was an awkward silence and she offered a slight smile. "You ah..." she rubbed her mane "You alright?" she said to try and break the tension

Curtain chuckled at the question. "Your 'post bedroom' talk sucks, sis."

With the tension lifted a bit, she laughed loudly. One of her hooves reached for her so they were pressed against each other. She moved it around, causing Curtain's foreleg to move with hers as she spoke "Do you think this is gonna change anything?"

Curtain moved her hoof in unison with Casting's in a way normally lovers would do. "Well that depends... do you want it to?"

"I'll... need some time to think it over. We shouldn't tell anypony about this though" she smiled softly. There was some clear concern in her eyes though, maybe she'd come to a realisation and had regretted this after all. Their closeness was very comforting. It was this feeling she found quite awkward, it wasn't something she should be feeling with a sister. Now that the hormones and lust had passed, the worries at the back of her mind started coming to the forefront.

Curtain tilted her head to the side slightly "Really? Cause I was hoping to make this part of my next comedy skit." She joked.

"Get outta here!" she laughed and knocked the hoof away. She stretched and pushed her chest forward, making her look larger. "Well, better shower before heading to see the magician" she smiled down at her.

"You're not the boss of me!" She yelled in a sarcastic manner. "I can do whatever I want."

"Come on" she flicked her head "Take off that collar, I'll help wash your back" she climbed off her. The loss of personal contact was sudden and she missed it immediately. She felt a strange emotional closeness to Curtain now that she didn't feel before. It was something she clung to in order to push the doubts and regrets from her mind.

The warmth of Casting's body had left Curtain and she lay there for a few moments already missing it, the warmth replaced by the slow cooling of all the fluids they had made together. Curtain was still finding it hard to believe what had just happened. A schedule check turned into a jealous fit, then turned into sex, incest no doubt. She quickly brushed those feelings away as she got up from bed and, in her usual manner, decided to make a joke to break the tension. "I call dibs on first shower!" She ran towards the bathroom, forgetting that the collar was still attached and the chain whipped around behind her.

Sometime later, after showers, makeup, clothing, food and everything else ordinary, they made it to the magicians show in the evening. Casting had been friendlier and happier than usual, she was a lot more cheerful than she was when Curtain first met her today. Not once did she mention what they did together or hint at any of her feelings relating to it. It was like they were just two ordinary sisters going out for a fun time. The time they spent together in ecstasy was a deep secret between them.
They'd made it to the show and she sat in her seat before it began, she had a tub of popcorn for the two of them. She sighed and smiled at the stage, quite eager for it to begin. She looked at Curtain and offered the popcorn toward her with a raised eyebrow.

Curtain gladly took a hoof-full of popcorn as she smiled at her sister, Curtain was also having a wonderful time and the show had not even started yet. After a few moments of sitting in relative silence, the quiet was broken by the sound of a mare with a boisterous voice. "And now... presenting... the grrrrreat and powerful.... Trrrixie!" The curtain's opened to reveal a light blue mare with silver hair, wearing a cape and had both decorated with stars. Curtain's heart leaped and her eyes went wide, she was so excited for the show to begin.

Casting grinned in surprise when the impressive wizard came onto the stage. As the act was warming up, Curtain would feel the comfort of her sister's hoof rest atop hers while they both watched. It was a small gesture. Invisible to the crowd around them. But it was a physical connection that meant a lot, as it revealed the closeness she now felt for her younger sister. Although she didn't say anything vocally, her body language gave quite a lot away. She was grateful. Thankful to have a sister she could be so close with, who understood her, came to her when she needed comforting. One who would arrange for them to see something like this because she knew how much her stressed out sister would appreciate it. More than that now, she had a sister that she knew intimately. There were no secrets between them. They had a bond that was unique, she understood that now, it was something she would never let go of.

When Casting lay her hoof on top of Curtains, she looked at it, then to her sister and smiled, also feeling a much stronger connection to her. Though she had no idea of Casting's feelings towards her until that afternoon, she was glad that she could be there to help Casting in whatever way she could. Curtain tilted her head to the side and continued watching the show, occasionally eating some popcorn.