Author's Note

Yes. This entire story exists just to use this chapter title.

A Night in Shining Armor

It was dark outside of Twilight Sparkle's window. The phase of the moon was barely a sliver of a crescent. Most of the rest of Canterlot was asleep at this late hour. The lights of the homes lining the streets were dark. Twilight's horn glowed dimly, bringing a small bit of light to her room. The clock on her nightstand had not proceeded much since the last time she'd checked.

She hated this. Laying in bed like this, waiting to sleep. She very much preferred when she fell asleep quickly, without effort. But the more she worried about falling asleep, the more her anxiety kept her sleep elusive. Worse still, she hated laying in bed at night alone with her thoughts. Normally her mind was focused on whatever task was at hoof. But with nothing to focus on, her mind wandered.

Sure, it was fun at first. Mentally working out logic puzzles, game theory, and paradoxical puzzles. But as the night wore on, it became more bothersome. Like that one time, a long time ago, she did that one thing, that was a little embarrassing to her, even though it was really minor, but now her irrational mind was magnifying it into this catastrophic transgression. She shook her head in frustration and checked the clock again. Time seemed to have entered the no-passing zone. She tossed and turned and kicked the blankets off. Even in the dim light, looking down at herself, she could clearly make out the lighter fur of her brother's lower half. She thought about Shining.

She still felt bad about what had happened earlier, grabbing him like that. She didn't know what had come over her. But all she knew was that she was better than that. He had been better than that his whole life living with this... thing. He deserved better than how she'd acted. She wondered if he was having as much trouble sleeping as she was. She climbed out of her bed and headed down the hall.

His door was closed, but only most of the way. She peeked through the door at the dim silhouette of his body laying in his bed. She pushed the door open slowly and quietly walked inside. He didn't stir. His eyes were closed and his breathing was slow and steady. He was clearly asleep. Twilight just stood there and watched her brother sleep, rather envious of his peaceful slumber. She had second thoughts about disturbing him. She'd already made things difficult enough for him. It seemed unfair to ask this of him too. But it wasn't her intention to keep him awake. She just needed help getting to sleep herself. That was all of the rationalization she needed to give herself.

"Shining?" Twilight whispered, and then asked at a normal volume, "Shining?" His breathing skipped a bit, taking a deep breath as his eyelids fluttered, squinting toward the direction of the voice.

"What is it Twilie?" he asked.

"I can't sleep," she said. At first he said nothing, waiting for whatever the second part of the statement was, other than just a status report in the middle of the night. He didn't know what to make of it.

"Okay..." he trailed off. She'd just woken him from a stone sleep. He wasn't exactly firing on all cylinders.

"I... had a bad dream," she lied. But the sentence had a bit more familiarity in this context. Shining blinked at her, unsure of what it was she was getting at. The last time she came into this room while he was sleeping like this, she was a little filly who'd only just gotten her cutie mark, asking if she could sleep in his bed. She was a young mare now. She'd been living on her own at the school dorms for a few years now. Surely she was capable of handling a bad dream on her own. She just stood there with pleading eyes.

Damn those eyes.

He sighed and shifted over in the bed, lifting the covers. She climbed in beside him as he rolled toward the wall against the bed, facing away from her.

"Thanks," she said.

The twin bed had gotten significantly smaller, it seemed, in the intervening years. Twilight reached over to lay her hoof across him to hug him while they slept.

"Um, actually," he said, turning back in the bed, "why don't you roll over." He motioned for her to roll onto her other side.

"Why?" she asked. "We used to always lay like this. I would hold onto you and it helped me sleep. You insisted on facing away from me."

"Yeah, well, things are a little different now," he said.

"Why? Because we're older?" she asked. Shining clenched his eyes in frustration. His sister was by far the smartest pony he knew. But every once in a while, she was dumb as a rock.

"No, it's because of the... other reason," he said. He motioned downward with his hoof. Twilight's face went through the entire spectrum of confused reactions.

"Oh? Oh. Oh!" she realized. "So before, went you faced away..."

"Well you saw what happened to you yesterday morning. Waking up with morning wood like that. I wasn't immune to that. And I didn't want it to... you know."

"Right, right." Twilight rolled away. Shining snuggled up behind her, wrapping his hoof around her chest. She put her hoof over his. "This is nice."

"Mmm." Shining kept his tone neutral. All he wanted was to get back to sleep. Twilight shimmied a little bit, feeling the softness of his fur behind her, his strong heartbeat beating through his rib cage, the warmth of his breath on her ears. She just listened to the sound of his heartbeat. It was steady as a metronome and it sounded like his heart was beating her name.

Twi-light. Twi-light. Twi-light. Twi-light.

Twilight felt her eyelids becoming very heavy. As she listened to the gentle rhythm, sleep took her.

Shining Armor stirred from his sleep some time later. He didn't even have to look at his clock to know that it was not even close to the wee morning hours. He thought he had remembered Twilight getting in bed with him. But as he looked in front of him, he didn't see her. It was probably just a weird dream from his memories of when they were younger.

He stretched a little and scratched his belly under the covers, his hoof bumping into his erect penis. Oh, hello there ol' buddy. He thought to himself, idly playing with his morning wood. It felt a little weird, but maybe he'd laid on his hoof wrong and it had fallen asleep, numb now. He took it in his hoof and stroked it a bit more, trying to get his sensation back. He heard a moan behind him.

His neck nearly snapped, turning to look. It was his sister, Twilight, behind him. He stopped moving his hoof. He couldn't have her catching him playing with himself with her in the bed beside him. Twilight stirred a little, shifting against him. He felt his penis move, between his legs.

Shining's eyes shot wide open and he pulled his hoof away as the adrenaline surged through him. Fully awake, everything came rushing back. The boxes. The partial body swap. Twilight in his bed. At some point, he must have rolled back over onto his other, natural sleeping, side. And she must have done the same, now, behind him. And now, facing him, her morning wood was somehow lodged between his legs, sticking out in front of him. Shining just froze, keeping completely still while he tried to think of what to do. He knew from experience that even the slightest movement would cause-

Twilight wrapped her hoof around him in her sleep, pulling him closer to her, pushing her cock further between his legs, making little jerking flexes with her hips as it throbbed, growing harder. He would be lying if he said the friction of it against his borrowed marehood wasn't pleasant. Especially if the wetness he was getting on her shaft was any indication. But he had to do something.

She was still asleep. He decided that he would just get out of his bed, letting her sleep in it for the night, and go sleep on the couch. But he was pinned on his small bed between her and his bedroom wall. He took her hoof with his and gently lifted it off of him. But even that small movement was enough to cause her to make a small humping motion between his legs. Shining bit his lip. His only way out would be to shimmy up to the head of the bed and climb out that way.

He reached up to the head of the bed frame, and pulled himself toward it, lifting his leg to minimize rubbing her. It was some awkward looking yoga, but he was grateful for his instructor's focus on upper body strength. He slowly made his way up along the mattress until he'd gotten about twelve inches along. It was just enough space for him to reach down and lift her penis off of his other leg and pass it between them back onto her side of his body.

He reached down and ever-so-gently, he took it in his grasp. It was very slick from rubbing against, and stimulating, his wet marehood. He lifted it in a slow arc, pointing to toward him to pass back between his legs. Then he would be home free to escape. Twilight shifted a tiny bit, but he kept his hoof coordinated with her motion like synchronized dancers moving together. Except that the dancers were his hoof and her penis.

He was about to pass it between his legs, but her movement had shifted her just enough to throw off his spacing. But he couldn't adjust himself with just one hoof. He tried to just go for it. As he pushed it back between his legs, the tip brushed against his marehood, parting the lips. The sensation on the tip of her penis caused Twilight to reflexively buck her hips forward.

"Nnnggghh," she grunted in her sleep. Shining felt the air leave his lungs in a silent scream. His mind raced. She was in him. Her penis was inside him. She penetrated him. Her penis was inside his vagina.

The time for subtlety was over.

"Twilie!" he whispered urgently. She wrapped her hoof around him again, pulling him closer. Shining grit his teeth as she pushed more of her length into him. He was whispering, he realized. Why was he whispering!? Was he afraid that he was going to wake up any pony other than the one pony he was trying to wake!? "Twilight," he said in an actual speaking-voice volume.

"Mmhhh," Twilight moaned, still half-asleep. Half-asleep was still not all-awake. She squeezed him, humping a few more times. He felt her throbbing harder, pushing deeper inside of him. Her hips slapped against the back of his, hilting herself. Inside, she bottomed out, slamming against his cervix, causing butterflies in his stomach to do a flip.

"Twilight!" he yelled. He felt her tense up, shocked into alertness of a sudden awakening. She stopped moving. "Get out!" he shouted. She looked around herself in complete confusion, not yet even aware of where she even was.

Shining- yelling- Shining's room- Shining's bed- Get out?

She felt hurt. He was yelling at her to get out of his room. In her daze, she didn't even understand why he was mad at her, or how she even got here. She could only do as she was told, and tried to get out of the bed. She felt a tension, pulling at her-

"Oh my gosh! OH MY GOSH!" she cried as she looked down at her penis penetrating her brother. She pulled away on the bed, pulling it out of him with a wet 'pop' in the wake of the void she left. She stumbled back in the bed, falling onto the floor. Her still-hard, wet cock whipping up and slapping her against her the belly. Shining sat up immediately, and rolled over to her edge of the bed.

"Are you okay?" he asked.

"What?"

"You fell. Are you okay?" he asked again. Twilight rubbed her eyes, sitting on the floor.

"Me!? What about you!?" she asked. "I- I was-"

"You were sleeping! Okay? It was an accident," he said. "I'm fine. I just should have... I should have just woken you up sooner. I don't know why I didn't."

"I'm sorry."

"Look, it's okay. You didn't realize what was happening," he said.

"I know but- I still feel bad about it. About everything." She wiped her eyes. "I should have just stayed in my room." Shining hated seeing her upset like this. He had always been so careful before, when they were younger. He couldn't even imagine how she felt right now. He tried to put himself in her position. If he woke up to her screaming at him while he did that to her? He would have thought she would be furious.

"Twilie, I'm not mad. Really. Please don't cry." He reached out his hoof to her, helping her to her hooves. "Come on, sit down up here." He sat up on the edge of the bed, making space for her to sit beside him. Twilight sat on the bed next to him, still erect in spite of everything she was feeling. She covered herself with her hooves. "Hey, it's nothing I haven't seen before," he said, trying to lighten the mood.

"I just feel... ashamed."

"I know. I felt the same way after my first... 'wet dream' too," he said.

"Really?"

"Yeah. I made a mess of the bed. I felt terrible. I hid it in the laundry. Do you remember when I started doing the laundry?"

"Kinda. I thought that you were just trying to be a good colt, or you had gotten in trouble or something."

"Yeah, well, now you know why. So I kept the chore from then on," he said.

"Heh."

"Heh."

They both shared an awkward laugh at the confession. Shining shifted in his seat. The sheets underneath were growing damp and sticking to his bottom. Twilight looked down at her stiff erection.

"Shiny?"

"Yeah?"

"Did it hurt? Did I hurt you when I... when it-"

"No," he cut her off. "I told you, I'm fine. You didn't hurt me."

"Oh. Okay." She kicked her hooves a little, hanging from off the edge of the bed. "What did it feel like?"

"What?"

"What did it f-feel like?" she asked again, nervously.

"I don't know. What did it feel like for you?" he asked, diverting the question.

"I don't really remember. I was asleep right up until the end and then- I was just so scared, I wasn't really focusing on the feeling," she said.

"Me too, I guess. I mean, I wasn't asleep, but I wasn't really, you know, focusing on it either. I mean, I guess you would know."

"What do you mean?"

"You would know how it felt for me," he said.

"No! I'm a virgin!" she said. "I've never... done that."

"Yes, that would be the definition of a virgin. But I think you mean to say that you were a virgin," he corrected.

"No!" she countered, searching for a retort. "That- that didn't count!" she said.

"Twilight, that was sex. Not even just the tip! It was like, penis-all-the-way-in-vagina, intercourse."

"But- but I didn't even finish!" she said, grasping at argumentative straws. Shining actually had to laugh out loud at that.

"Doesn't matter; had sex."

"But it wasn't my penis!"

"Doesn't matter; had sex."

"But you're my brother!"

"It still counts!" he said. Twilight frowned. "Twi, listen, it's not that big of a deal." He re-thought what he just said. "Okay, what happened just now was kind of a big deal. But losing your virginity isn't. Not really. I don't understand why everypony puts such a big importance on it. The simple fact is we, however briefly, had sex. And we are no longer virgins."

"I guess, but what- wait, we!?" she asked, surprised.

"Well, duh I'm not a virgin. It was sex for me too," he said.

"No, I mean, you just lost- this was your first time too?" she asked.

"Um... yes?"

"Really?"

"Yeah. Why?"

"I just thought, you know..." She blushed. "I just thought that you had a marefriend and did... it already. You know, with how you look."

"How I look?" he asked.

"Yeah, I mean, you're attractive," she said.

"You think I'm attractive?" he asked. Twilight blushed harder.

"Yeah, I mean, I can admit that you're objectively attractive. I'd have to be blind to not think so. You're strong, handsome, nice." She looked at the large erection she still had. "And you've got this going for you," she said, pointing at it.

"Oh. Well, thank you," he said.

"What about me?" she asked, fishing for reciprocation. "Do you think I'm attractive?"

"Sure!" He dialed back the enthusiasm of the response. "I mean, you know, objectively and all that stuff."

"Thanks."

"So you never answered my question," he said.

"Which one?" she asked.

"Well, you asked me how it felt, and I said that you ought to know," he said.

"But I wouldn't because I'm- I was a virgin," she said.

"Yeah but, don't you- I can't believe I'm asking you this," he sighed "Don't you have like, toys and stuff? Dildos?"

"No!"

"You don't have to be embarrassed about it."

"No I really don't! I don't-" Twilight looked away, out the window for a moment before turning back, "I don't really like penises. I think they're gross. I- I guess I prefer mares."

"Oh."

"Do you think I'm weird because I'm a fillyfooler?"

"What? No! Twilie, that- that's fine! That's totally cool! If that's how you are, then that's just who you are."

"Really?" she asked.

"Of course! Twilie, you're my little sister. I'm going to love you no matter what. It doesn't matter what your sexual preference is. In fact, I guess I'm even happier!"

"Why?"

"Well, now I don't have to worry about some stallion trying to hook up with you."

"Shining-"

"Don't get mad at me. I'm an older brother, I have no control over it. Protectiveness of my little sister is in my damn DNA."

"Aww." She leaned against him, snuggling into his broad chest. Her penis leaned over with her, bumping into his leg, spoiling the moment. "Oh, sorry."

"It's alright. Don't worry about it." He looked down at it, resting across his purple thigh. "I guess I'd be a little weirded-out too if I had some other stallion's penis attached to me. I mean, I like mine, but I think others' are gross too. So I guess I can imagine how you would feel being stuck with one if you didn't like it."

"Hmm," she agreed.

"So you like mares huh?"

"Yeah. I guess it's just taken me a little while to admit it... to myself," she said. "I just, I don't know what I would do if I ever, got with a mare."

"What do you mean?"

"Like, sexually."

"Really?" She nodded. He scratched his head. "Well, geez Twi, I'm not a fillyfooler, but I would think that you would just do whatever feels good for you. You know? Just do that, for her."

"Well yeah but-"

"But?"

"But I've only ever used my hoof. What if I try to use... my mouth?"

"Like I said, just do what you think would feel good for you."

"But what if I do it wrong?"

"Well Twi, I'm a stallion. At some point I plan on going down on a mare for the first time. And I'll have to do it with no prior experience. But as long as you have an understanding partner with good communication, she'll tell you what she likes, what you're doing right, or wrong, and you'll learn. It all part of life."

"Huh. Okay." She leaned against him for a little while while he rubbed her back. She looked down at her penis laying against his leg. She averted her eyes, looking instead at her own crotch, attached to him. "Shiny?"

"Yeah?"

"Can I practice?"

"Sure."

"Really!?"

"Yeah- er, wait, what do you mean?"

"Can I practice on me, on you?"

"What!? No!"

"Shiny! Come on! Why not?"

"Twi, look, I'm not going to bother pointing out how weird this weekend is at this point. I think it's pretty clear. But these are extraordinary circumstances. What happened in the bed was an accident. And the other stuff-"

"Well, I feel bad about last night when you got me off with your hooves, and-"

"My mouth."

"Again, I'm sorry about that. I don't know what came over me," she said

"I know. Like I said, it's been a pretty fucked up weekend."

"But I feel like I should at least return the favor," she said.

"Really, Twi. It's okay. We're cool."

"And if I could get a little practice learning how to do it..."

"Twilie, really, all you need is an understanding partner to teach you."

"But you could be that."

"Twi-"

"And, after all, it is my marehood. And just think, you could find out what it feels like for a mare! Don't tell me you aren't at least a little bit curious! I mean, scientifically speaking, we really should explore this opportunity!"

"Scientifically speaking?"

"Shining, when are we ever going to have another opportunity to try this?" she asked.

"Hopefully never!" he said sternly.

"Pleeeease?" she pleaded, pouting her lip, looking up at him with those big, purple eyes. He just glared at her. It was those same eyes years ago that got him to sneak extra cookies for her when their parents weren't looking.

"Begging for it?" he asked. She nodded. "You know, for only your third day, you're very good at being a stallion." She smiled at the joke. He sighed and shook his head in complete disbelief. "I can't fucking believe this is happening." He huffed in defeat, "Alright, fine!" He shuffled back up onto the bed.

Twilight practically squealed. She closed the blinds and turned on the bedside lamp before she moved around to the foot of the bed. He settled into the pillows on his back. She stood there and waited. Shining laid on the pillows in a slight incline with his legs firmly pressed together, suddenly feeling incredibly self-conscious.

"Uh, Shiny? You need to uh..." Twilight made a spreading motion with her hooves.

"Right. Umm..." Shining Armor nervously spread his legs for her. Twilight all but dove onto the bed between he legs, scooting as close as she could. Shining winced, waiting for what would happen next. But there was nothing. He opened his eyes and looked down at his sister, staring intently at his, well really, her marehood. "Uhh, Twilie?"

"You know, I've never gotten a chance to look at myself."

"Mirrors?"

"Yeah, but I've never really gotten a chance to get a good look at myself like this!" she said with a strange glee. She moved the lamp over, directing the light.

"Oh. Uh, happy to help." Shining said nervously. For somepony that spent most of his life nude, it was strange feeling this completely exposed. There was just such an intense intimacy about her examination. He nearly jumped when he felt her hooves on him. She was only touching his legs, lifting them up.

"Just getting a better look," she said, pushing his legs up, pressing them to his chest, watching how it stretched and changed shape. He tried to keep himself relaxed for her while she moved him around. Then she spread his legs straight apart, much to his surprise, but she was proud of her flexibility. She let them rest on the bed in a comfortable position. "I'm going to touch it now," she stated plainly.

"Uh, o-okay," he stuttered. He took a sharp inhale when she made contact with his labia, spreading them apart. His heart was racing. Twilight seemed incredibly calm by contrast as she looked over her own genitals up close.

"This is so much easier from this angle," she said plainly. By the look in her eyes, it was like she was just mentally identifying and cataloging each part's name that she'd learned from a text book. 'Classic Twilight', he thought. "So how do I do this?" she asked after some time.

"Well T-Twi, like I've s-said," he grit his teeth trying to keep calm, despite her hooves on his pussy, "I've never done it for a mare either, so I g-guess this will be a learning exp-p-perience for both of us. Just do what would feel good for you."

"And you'll tell me if I'm doing well?"

"Yeah."

"How should I start?"

"Well, your hooves have kind of already started," he said. She looked at her hooves. She moved them a little, watching the way the lips stretched and flexed. "Ooh."

"Does that feel good?"

"Yeah!" he breathed.

"What should I do next? Should I- should I lick it?" she asked.

"If you want."

"Where?"

"Anywhere. Everywhere!" Shining said impatiently, surprising them both. "Go nuts. You can't miss." Twilight stuck out her tongue pointedly, as though she were teasing in kindergarten. She had tasted herself before out of curiosity on her hoof after playing with herself. But this was her first time directly. Something about that fact made it new, and a little intimidating. She leaned in closer. Shining was absolutely on-edge as he felt her warm breath on his nethers.

At last her tongue made contact, on the inside of one of his lips. A rather plain spot compared to the rest of the points of interest. It was still plenty moist with his wetness. Twilight ran her tongue up along it and pulled away, focusing on the taste in her mouth. It was more-or-less as she remembered, if perhaps a bit stronger from the concentrated source. She licked the other side, along the other lip. Shining shuddered.

"Did that feel good?" she asked.

"Yes!" he answered. She worked her way down to his opening, licking around the outside, and lightly across it.

"Haw abaht hat ?" she asked with her tongue still busy.

"Yes!" he answered again. "Actually, push your tongue inside!" he instructed. Twilight did as she was told, making her tongue rigid and pushing it into his vagina, wiggling it around as her nose pressed against the rest of his marehood. "Oh! Ahhhahh!" he moaned. He'd had bigger things in there by his own hoof. But when it was somepony else doing it, it felt way more intense. She paused after a moment, coming up for air.

"How did that fee-"

"Amazing! All of it! Everything feels amazing! SoStopAskingAndKeepLicking!" he demanded.

"Sheesh!" Twilight lowered her head back down, licking his pussy again. Up, down, side to side, gauging his reactions to see what worked. She ran her tongue up from the bottom of her entrance all the way to the very top, flicking her tongue against the last part.

"WHOA!" His hips bucked completely up off of the mattress smacking her in the face. She was fine but she looked up at her brother.

"What was that? Are you okay? Did I hurt you?" she asked. Shining shook his head.

"N-no, Its just that last part at the top is really sensitive, you know?" he said.

"Yeah, I know, but geez, I didn't hit it that hard."

"It's okay, I just wasn't expecting it. Do it again, but just, ease into it, okay?" he asked. Twilight nodded. She did the same motion, starting at the base of his pussy, licking her way up. She moved slowly, deliberately. She wrapped her hooves around his legs, holding him still this time. She pressed her tongue flat against the last part, brushing slowly across his clitoris, gradually increasing pressure. She could feel him tensing at the sensation. She slowly closed her mouth over it, lightly sucking as she continued to move her tongue across it. His legs trembled in time with her tongue's movement, slowly increasing in speed and pressure. Shining was moaning uncontrollably. Twilight could read the signs. "Twi, I uh, I- Twi! Uh, Ah, Ah, AH AHHHHHHH!" Shining's head snapped back as he cried out. His hips bucked and shook as Twilight held on, riding along with him as he came. She felt him cumming, releasing his clit and licking lower, getting more of his juices in her mouth, on her nose and cheeks, dripping down her chin.

"Twi! Twi!TWITWITWI! Stop! Too much!" he cried out. Twilight pulled her face away, satisfied with a job well done. Shining's head was still spinning. He struggle to catch his breath, panting hard.

"So I did well?" she asked, with smug confidence. His eyes focused again from the daze of his climax.

"Oh yeah! A+ kiddo. You're going to make some mare very happy some day!" he said.

"Thanks, Shiny," she said with a smile. He looked down at her between his legs, her face wet with marecum. Maybe it was the orgasm talking, but for him, it didn't matter who she was right then. She looked hot. Twilight got up off of her belly onto her elbows. Having her face buried in a mare's pussy was having a powerful effect on her. Her penis was so hard it was positively aching for release. "Shiny?"

"...Yeah?" he answered, a bit delayed. Between the late hour and the oral sex, he was skirting the edges of unconsciousness.

"Can we finish?" she asked.

"Yeah, sure!" he answered. Twilight climbed up the bed, hovering over him. Shining looked up at her, a bit confused. He thought she wanted to finish eating his pussy and go to bed. "Uh, Twi, what are you doing?" he asked. She looked down between them, guiding her penis with her magic.

"Finishing, from earlier," she said. He felt her penis brush against his pussy.

"Wuh wha wait a minute! No, no!" He tried pushing her away, regaining his alertness.

"What? Why not!?"

"Twi, I- this has all gone too far already! We can't actually have sex!"

"Yes we can! It's easy. Watch." She pushed her penis against his pussy again. He stopped her again.

"I mean we shouldn't. Like, we really really shouldn't!" he said.

"But we already have! Kind of."

"Twilie,"

"We lost our virginity to eachother!"

"Twilight, please!"

"You said it yourself! We've had sex! All I'm asking is for a chance to do it one more time, like this, and to at least be awake for it this time!"

"That doesn't make it okay!"

"When are going to have another chance to do it?"

"Twilight, just because you have a chance to do cocaine, doesn't mean that you should!"

"Why? Do you have some?"

"What the hell is wrong with you!?!?"

"I'm kidding! I'm just trying to keep things in perspective here!" She put her hoof on his pussy, rubbing it. "Come oooon!" Shining closed his legs together, only serving to trap her hoof against his pussy as she continued to rub him. "Don't tell me you don't want to. You keep saying we shouldn't. But you can't honestly say that you don't want to." Shining bit his lip, stifling a moan.

"That's not fair." He tried to squirm away from her hoof. Admittedly, he didn't try very hard.

"Come on. Answer the question. Do you want to? Do you want to have sex? Do you want me to f-fuck you with this?" She grinned and looked at his menacing cock she was brandishing at full attention. "You do, don't you? Admit it. And don't lie to me Shining Armor, you know I will know if you are lying."

Shining tried to lie. All he had to say was 'no'. N. O. But she was right. He did want it. He did want to have sex. He wanted to feel that cock inside him, to have that feeling of fullness again. He wanted to have another orgasm as a mare. He wanted to feel that bliss once more. He wanted it so badly it burned. He looked her right in the eyes. She wasn't really being aggressive, or scary. She was just absolutely confident that she was right. She wanted it. And he wanted it just as badly as she did. And she damn well knew it.

"Do. you. want. to. have. sex?" she repeated. He closed his eyes and whispered his admission.

"yes"

The pressure of his legs on her hoof relaxed. She moved slowly, lifting it away. She wasn't about to force herself. She waited, letting his knees fall to either side on their own. She lowered herself onto him, guiding herself with her magic. Releasing a spell, she pressed the tip to his entrance, getting it slick his wetness. A bit more pressure and she parted his lips. Shining took a deep breath, Twilight pushed the tip inside.

Twilight tried to go slow, restraining her every drive to plunge in. Shining could tell she was trying to go easy on him, reluctant as he had been. She wanted to make sure he was on board with proceeding. He wrapped his legs around behind her, pulling her the rest of the way inside him, filling him completely. She looked down at him. He looked up at her and grinned. He made it clear that he was on board with proceeding.

For a while, he just held her there, enjoying the fullness. A part of him, an decreasingly small part, was screaming that this was wrong in every possible way. But that voice was drowned out by the bigger part of him wondering why they hadn't been doing this from day one. She made little movements in the restraint of his legs wrapped around her. He finally released her, giving her the freedom of movement to really feel good. She slid almost all of the way out, and then back in again. Not slamming it in fast, nor particularly slowly. In steady, smooth movements, getting used to the feeling of his pussy around her cock, and letting him get used to her moving inside him.

In and out, he could feel her inside him. The veiny texture of her cock stimulating his every vaginal nerve ending. Each time she pushed in all the way, her pubic bone bumped into his clit, sending waves of pleasure through his body. And her cock would push into his deepest barrier, pressing against his cervix. It wasn't a pain, nor a pleasure. It was just a strange pressure each time. But it was all part of the mixture of sensations she was giving him.

For Twilight's part, she was in absolute heaven. Shining's mouth was one thing, but this was leagues better. The warmth, the wetness, the snugness of it! It was absolutely perfect! Her first time properly having sex as a stallion, it was so much. She had been aroused all evening, and now, she teetered at the brink of climax. But she knew that when she cums, it would all be over. She mentally steeled herself, keeping from finishing too soon. She pushed completely inside him, pressing herself against his clit with her hips, grinding against it in the way she knew would surely drive him wild.

Shining could do little more than lay there and take it as she continued to thrust in and out of him. Twilight reached down with her hoof, playing with his clit as she made little thrusts about half-way inside him. She leaned back, changing her angle inside him, directing her cock against his front wall. Shining looked down and could see the bulge of her cock through his belly, moving up and down as she fucked in and out, really giving it to his G-spot. Twilight could feel his body shudder, and his pussy spasm around her, gripping her, milking her cock.

"Ah, ah Ah AH AHH!" Shining cried out. His pussy flooded with the new wetness of his marecum, spurting out from around her cock. Twilight tried desperately to ride it out but his pussy was practically vibrating. She could feel her balls tighten, the bolt of lighting at the base of her spine. That feeling of weightlessness that overcame her as Shining's pussy continued to orgasm, milking her cock, pleading for her cum. She felt herself going over the edge, past the point of no return. Her thrusts became frantic as she wrapped her hooves around him, holding him tight to her.

"SHINING!" She cried out, slamming it home. Shining could feel her cock swelling inside him, the tip flaring wide and pressing hardest yet against his cervix. She was about to cum. He panicked.

"Twilie! No! NOT INSIDE!" he yelled! But it was too late. She was deaf to the world. He felt her heavy balls twitch against his marehood, the first, thick load of cum shooting up her throbbing, pulsing shaft, bursting inside of him. Her cum felt so hot inside him, filling what little room was left. Her cock filled his pussy completely. The next rope of potent seed came flooding forth. His vagina was already at capacity. She pushed into him again with the third rope of cum pumping inside, with nowhere else to go but in, forcing the cum through his cervix up into his womb. Shining was never one to shy away from an eating contest. But never in his life had he felt as full as he did then and still more cum pumped into him, flooding past the seal of his final barrier.

"Twilight! You shouldn't havfmfff-" Twilight's eyes were barely open as she kissed him, hard. Shining experience a very uncomfortable mix of feelings. He was still feeling the aftershocks of his maregasm, made more intense by her cock, still twitching in orgasm deep inside him. The fullness of her flared cock head stretching his insides to their limit. And what felt like a pint of semen sloshing inside him. And he could have wrote it all off, all of it, to one crazy weekend. Sure, there wasn't enough alcohol and therapy in the world to forget what had happened this weekend, but he could find some way past it once they got their normal halves back. But when she kissed him, it was a sharp reminder that on top of all of it, on top of everything that had happened, this was his sister.

And this was not a sisterly kiss.