Obsession and Reward

by Keairan

Rating: mature
Tags: Twilight Sparkle, Anthro, Porn, My Little Pony: Friendship is Magic, Romance, Shining Armor, Sex, Slice of Life
Length: 5930

Gleaming Shield spies her sister's equipment and wants to serve it and her.

Thanks to a magical accident, Shining Armor is now Gleaming Shield, and her little sister is packing something extra. Quite by accident one day, Gleaming sees her sister's package, and now has an unquenchable desire to experience it for herself.

Fetishes: Incest, Futanari, light BDSM, Potential Impregnation and bad interior decorating.

Entry in Dezmo's NSFW Contest

Published 2022-08-14 18:50:00 UTC
Last updated 2022-08-14 18:50:00 UTC

Obsession and Reward

Gleaming patrolled around Ponyville, feeling both boredom yet also excitement at getting to see Twilight that evening. Ever since her transfer to the sleepy town, their schedules had been such that spending any time together was next to impossible. But of real interest was why Gleaming had transferred to Ponyville at all.

"You want to what?!" Her commanding officer, Colonel Spear Wall half-shouted at his lieutenant.

"I would like to transfer to Ponyville." She replied, calmly.

"I heard you the first time. Why on earth would you want to transfer to there?! That place is practically a punishment detail! You're on fast track to captain, too! Do you want to just throw that away?" The brown-coated pegasus with a white mane asked, incredulous.

"No, I have my reasons. And right now they feel far more important than any promotion." She calmly stated, staring straight ahead.

"Right, right, your sister moved there as part of her classwork for the Princess." He shook his head. "I'm guessing that you want to protect her."

Gleaming nodded, though that was a lie she didn't trust herself to speak.

"Fine. I'll approve the transfer order. But, do know that you're probably going to end up retiring a lieutenant, Gleaming."

"I'll cope, sir!" She firmly stated.

"Dismissed." He said with an almost sad air.

"Thank you, sir!" She said and walked out of the room.

No, the real reason she asked for the transfer wasn't just her sister, but her eighteen year-old sister's cock. After the Nightmare Moon incident, she happened to be home at the same time as Twilight was and had accidentally walked in on her taking a shower. The futanari mare had stepped out of the shower with morning wood and Gleaming had gotten a good look at the strangely familiar piece of meat. An erection that was larger than any porn star and testicles that seemed like cantaloupes. 'How does she keep that hidden?' crossed her mind before she walked back out of the bathroom, embarrassed.

However, even after apologizing, she did her best to spy on her sister, and see the massive mare-cock again and again, gaining more success as that visit went on. By the time the visit was over, she had seen her sister's package a grand total of ten times, a success she used to jill off to a seemingly uncountable number of times.

Having finished her patrol, Gleaming took a shower, changed into a brown blouse and purple skirt, then went to Golden Oaks treebrary to meet up with Twilight and Spike for a meal and some time to hang out. When she got there, she noticed that it was just her and Twilight who happened to be wearing a lovely olive-colored sundress. "Where's Spike?" She asked as she gave Twilight a hug.

"Oh, he and the crusaders decided to have an overnight sleepover. I know you see him more than I do so I gave him the go-ahead." She replied as she returned the hug. "I made us ratatouille for dinner."

Gleaming smiled. "My favorite Prench dish! You didn't have to, Twiley."

"But I wanted to. You're still a fan of rosé, right?" Twilight asked, making sure.

"I am, and thank you!" She replied happily.

"I've already set the table, come in." Twilight told her sister.

Gleaming nodded and headed straight for the table, but was stopped from pulling out her own chair by Twilight doing it for her first.

"Have a seat, Gleamy."

"Well thank you, Twiley." She sat down as she looked at the spread in front of her. Ratatouille in a pan covered in lavender magic to keep it warm, fresh-baked bread in a basket with chive butter, and of course the wine. "My goodness you've made a feast."

"Not really, but I think did a good job." She smiled. "Though Pinkie did help me with quite a bit of this. Overall, though, my cooking has gotten better, assuming I'm not using cheese." she shuddered.

Gleaming nodded and winced in sympathy. "Did that scar on your forearm from the cheese burns ever heal up?"

Twilight shook her head. "Mostly, though my summer coat coming in does briefly expose it."

"Makes sense, but that is annoying." Gleaming replied.

"I know you had a decently bad wound at your first post, how did that heal up?" Twilight asked.

Gleaming smiled and took a bite of the ratatouille. "This really is good. As for your question, it was a elk horn wound from one of the rogue groups up on the north border. Gored me with my spear through his body. I obviously lived, though they had to grab a magi-surgeon from North Command who put my gut back together. Didn't even leave a scar. In fact, the worst part of recovery was the itch from my fur in that spot growing back." She lifted up her blouse and separated the fur of her belly. "See, you can't even tell."

Twilight laughed. "I bet mom had a fit. Also, I'm glad you like it." She cut one of the hunks of bread into a slice and spread some butter on it before taking a bite. "Mmm, wow, this is excellent. Have some of the bread, Gleamy!"

Gleaming smiled at her sister's exuberance. "Alright, Twiley, I will."

The conversation between the two drowsed as the two siblings ate and drank, enjoying the delicious meal to the fullest.

The two siblings sat on the library couch next to each other, enjoying the familiar feel of each other's presence as they talked and sipped port. Gleaming in particular was listening to her sister's words intently.

"-and so there we were, trying to get Lyra out of the Everfree and away from the cragodile when suddenly-" Twilight abruptly cut off, and looked down at her lap. "Uh, Gleaming?"

Gleaming also looked down, and noticed that her hand had been stroking along Twilight's inner thigh and part of her bulge. "Oh Celestia!" She yelped in horror as she jumped up from the couch and attempted to run away.

Twilight with surprising strength grabbed Gleaming's arm and pulled her back down onto the couch and into a kiss.

Gleaming's eyes opened enormously wide in surprise before closing again as she leaned into the kiss, hungrily returning it.

Twilight slipped her tongue into Gleaming's mouth, pleased at combination of flavors on her sister's mouth, including one that was solely Gleam's.

Gleaming moaned into the kiss, letting her little sister's tongue direct how her own could respond.

Eventually, Twilight broke the kiss and looked at her big sister with a mixture of love and lust.

Gleaming returned the look with elements of the same, but mostly confusion. "W-w-why would you-?"

Twilight finished her statement for her. "Why would I kiss you after you groped me?" she asked with a knowing tone.

Gleaming swallowed and nodded.

Twilight let out a laugh. "Gleaming, you've always looked at me with less than sisterly eyes, though you've never been crass about it." she added, seeing Gleaming's panicked look and shake of her head. "Gleaming, I know you saw my 'appendage' multiple times during my last visit home. I arranged for you to. Your interest was obvious there, and your desire to act on it even if vicariously made all the more obvious by your transfer here."

Gleaming opened her mouth to reply, but Twilight put a finger in front of her lips. "Gleaming, I'm not bothered. In fact, I find it hot!"

Gleaming finally managed to get a dry-mouthed reply out. "Why?"

"Because I love you. Because you are gorgeous, smart, and everything a mare like me could want in one amazing package. If you doubt that, take a feel of my friend again."

Gleaming gingerly felt of her sister's turgid length, amazed at the length of it even feeling it through Twilight's dress. "Twiley, you're huge!" she gasped.

"Thought you got a better look than that, Gleam." Twilight snarked.

"I did, but seeing from the doorway is quite a bit different from feeling it, even through cloth." Gleaming responded.

Twilight leaned in close. "How would you like to get a better look at all of me, and feel me, too?"

Gleaming could only nod, not trusting herself to speak.

Twilight smiled and then began to pull her sister with her upstairs to her room. After getting to her room, Twilight pushed Gleaming onto the bed. "Sit and watch. No touching me or yourself."

Gleaming sat at attention, her hands folded in her lap, desperate to see where this was going.

Twilight turned her back towards Gleaming, and started to shake her hips left and right, showing off her ass to her sister. As she shook her hips, she started to slowly turn, showing off her jiggling package and breasts in profile, then facing her. Having finished her turn, she began to teasingly slide up her dress, but stopped just barely showing the bottom of her black lingerie panties. Slowly she gave longer and longer teasing glances of her package-stuffed panties, eventually letting her look for twenty long seconds.

Gleaming looked on in hungry lust throughout the dance, her own panties soaking through with her nectar. She rubbed her thighs together in an attempt to provide some stimulation to her aching quim, but Twilight clearing her throat quickly put a stop to that with a quiet whine from Gleaming's throat.

Twilight slowly turned back around, and upon being completely turned around, she slowly removed her sundress, revealing her matching black bra. She turned back around and accentuated her own large and perky breasts with the motions of her hands, showing off the bra-clad flesh to the now drooling Gleaming. Twilight reached out and took hold of Gleaming's hands and placed them over top of her breasts. "You may touch me, for now."

Gleaming didn't waste any time and began to feel her sister's breasts, gently rubbing and squeezing the cloth covered mounds, adding her own happy moans to Twilight's pleased moans at her sister's touch.

After a time, Twilight said "Stop!" and Gleaming immediately stopped.

Twilight backed away, and slowly took her bra off, reveling her achingly stiff nipples to the air and Gleaming's view. Twilight then turned around, bent forward and slowly pushed her panties down her legs, revealing first her tiny starfish, then her pussy, followed by her pendulous testicles and finally her lengthy cock. Twilight finished by stepping out of her panties, then turned around to show off her full body to Gleaming. Twilight ran her hands down her body, framing first her breasts, then her coal-black cock, and finally her balls. "Gleaming." Twilight finally spoke.

"Yes Twilight?" Gleaming answered in a small, desperately lusty voice.

"What do you want to touch most on me?" she teased.

"Your cock." Gleaming answered before audibly gulping.

"And what are you willing to do to do that?" Twilight asked.

Without hesitation, Gleaming answered "anything. Absolutely anything."

Twilight clarified. "So if I told you to suck on my breasts?"

"Yes."

"What if I told you to worship my nuts?"

"In a heartbeat."

"What if I told you to eat my pussy?" Twilight continued

"Mistress I would do it." Gleaming asserted.

Twilight started at her statement. "Mistress? Bit soon to be calling me that, isn't it, my BSBFF?"

Gleaming's face turned blood red through her fur. "I-I-I-I" she stammered.

Twilight leaned forward and pushed Gleaming's face into her tits. "For now, worship my breasts with your mouth while we figure out where we go from here."

Gleaming immediately captured one of Twilight's nipples in her mouth and began to suck on it for all she was worth, laving her tongue over the ripe berry while occasionally gently nipping at the tender bud. Gleaming happily moaned into the breast she was worshiping before swapping to the other one, giving it the same tender treatment.

Twilight moaned and enjoyed the loving worship by her big sister for a while before deciding that her breasts had had enough and pulled her mouth away. "Thank you, that felt lovely. You have a talented mouth. As thanks, I'll let you choose what you use that talent on next. My balls, or my pussy. Which would you prefer?"

Gleaming leaned back, and began to think. 'Do I want that amazing smell from her balls in my mouth, or do I want to taste that delicious looking quim? Oh, this is such a difficult decision, I don't know how I'll decide.' After a minute more, Gleaming finally had an answer. "I want to worship your nuts, mistress."

Twilight smiled at that statement. "Well, my lovely slut, I guess I'll let you do that... after I remove your clothes."

At the word 'slut', Gleaming shuddered with pleasure. "How do you want to remove my clothing, mistress?"

Twilight smiled and projected a field through her horn and used it to pick up Gleaming, leaving her floating in mid-air. "Like this." She flipped Gleam's skirt up, exposing her lavender panties to her sister's sight. "Lavender, hmm? I take it a certain someone has become a little obsessed?"

Gleaming nodded nervously.

Twilight smiled and reached up to grasp at Gleamings panties, and began to slowly pull them down. With each inch of flesh that she uncovered, Twilight gave her sister's mound a kiss, though she purposely avoided her actual pussy. As Gleaming's inner thighs were exposed, Twilight began to kiss and nip her way down, finally stopping at the inside of her sister's ankles and removing the piece of cloth completely.

Gleaming, for her part, squeaked with each nip as her pussy began leaking copious amounts of fluid from her thoroughly aroused sex. "Oh, mistress, that feels amazing!"

Twilight smiled. "I'm glad you like it." Shifting her field, she moved Gleaming's top to within easy reach where she slowly teased Gleaming's blouse off of her, revealing the lavender bra underneath. Twilight threw the piece of cloth off to the side before capturing Gleaming's mouth for another scorching kiss while she undid her sibling's bra. After the bra went the same route as the blouse, Twilight played with her sister's breasts with her hands, tweaking her sibling's stem-hard nipples while rubbing the surrounding flesh.

Gleaming moaned hungrily into her sister's mouth before a particularly sharp pinch made her scream into Twilight's mouth as she finally came. Juices fountained from her slit

Twilight pulled back, amused and slightly wet. "Well then, I see you enjoyed that, my lovely slut." Having said that, Twilight pulled off Gleaming's skirt with far less fanfare before giving her sister's ass a little spank.

Gleaming moaned at the spank, and looked to her sister, ready for her instructions on what to do next.

Twilight finally put Gleaming down and took hold of her horn, directing her to her balls. "Well slut, I want every inch of them cleaned with your tongue. If you don't, I might just not let you touch either my cock or my quim. And we wouldn't want that now would we, slut?"

Gleaming shuddered at each repetition of the word slut before opening her mouth and doing her absolute best to polish Twilight's testicles to a Gleaming shine. Every inch, a concentrated movement of her tongue to clean and pleasure the balls of the mare she would call mistress; her sister.

As Gleaming licked her balls, Twilight couldn't help but begin to leak pre from her prodigious and hard as diamonds cock, the slime of it dripping down into her present ball-cleaner's hair. "Mmm, that's a good girl! Clean my nuts off with your tongue! Worship what's going to fill your mouth and slit with the cum you've been dying to taste!"

Gleaming moaned in delight as her hair was covered in Twilight's gooey syrup, happy that she would smell like her goddess's spend until she next washed her hair. She frowned slightly when she realized that Twilight's massive balls would never fit into her mouth. Her face then brightened again when she realized that her sister's prodigious size would mean all the more massive loads of what was sure to be exquisitely delicious cum for her to taste and enjoy.

Twilight let Gleaming worship her cum tanks for a while longer, then finally pulled her groin away from her sister's submissive mouth, which elicited a disappointed whine from the mare. "Now as much as I enjoyed that, I think it's time for you to have a reward. You have my permission to rub your slutty cunt against my leg until you cum."

Gleaming immediately changed position so that she could start to hump Twilight's leg. "Thank you, mistress, for letting this slutty mare get off using your body!" Up and down the horny unicorn mashed her horny clit against the silky-soft fur of Twilight's limb. Wound up as she was, it didn't take long for the expected to happen and she soaked her queen's leg.

Twilight smiled as she felt her sister's cum on her leg. Shaking her head, she decided she'd lean into the mistress angle. "Naughty slut, you got my leg dirty with your cum! Once you clean it up with your tongue, I'm going to have to punish you!" She promised while waggling her finger.

Gleaming opened her mouth and then shut it, confusion written on her face that soon turned into a smile as she started to enthusiastically clean up her mess from her sister's leg. Between licks, she let out apologies. "I'm so sorry for getting your leg dirty, Mistress! I promise that I will clean your perfect leg to your satisfaction before you punish me!"

Twilight mock-glared at the desperately horny mare in front of her. "See that you do, Gleaming, or your punishment will be worse!"

Gleaming finally finished cleaning her sister's leg off, the fur covered only in her saliva. She looked up at her mistress with pleading eyes. "How do you wish to punish me, my goddess?"

Twilight hid a snicker at the title before answering the question. "Lie across my lap, my Gleaming slut, and I shall spank you. As I do so, I wish for you to count off each blow!"

Gleaming clamored up as fast as she could, a movement that might have made one wonder if she could teleport! Out into the room she stared at a particularly ugly piece of furniture as she waited for the first blow to fall. "I'm ready, mistress!" she called just in case Twilight was waiting on her.

Crash! a hand landed against her backside delivering the first blow! "One!" Gleaming croaked out at the blissfully painful strike. Crack! the hand landed a second time! "Two!" Gleaming moaned out. Gleaming groaned out her joyful count at each strike, wondering if she would end up cumming from the rapturous assault.

All too soon for Gleamings liking, Twilight stopped spanking her submissive slut of a sister as the count hit fifteen. Gently while channeling soothing energy through her horn, Twilight massaged the reddened flesh of her lover. "Because you've been such a good girl, taking your punishment and cleaning up your mess, I will let you suck my cock while I pleasure your naughty cunt. Following that, I'll clean it with my cum." Twilight smiled at Gleaming reassuringly.

Gleaming's smile at her spanking grew into a grin. "Oh thank you Mistress Twiley! Thank you for letting me suck your magnificent cock!" She started to move herself to get into position before Twilight picked the white unicorn mare up with her magic before lying on her back on her bed. Turning her about, Twilight lowered her down to where Gleaming's sopping wet cunt was right in front of her mouth and her cock was in front of Gleaming's muzzle.

Gleaming opened her mouth as wide as she could to let the behemoth of a cock into her mouth. As the flat head passed her lips she started to desperately roll her tongue over the beautiful column of girl meat. Up and down she bobbed her head, worshiping her sister's powerful prick.

Twilight stared at the dripping lips in front of her, smiling at just how needy her big sister was. Cautiously she extended her tongue to take a lick of her sister's slick slit, starting at the front and moving all the way to the back. Pleased at her pleasantly mild flavor, she took a second and third lick of the piquant pussy. Thinking of a way to add to Gleaming's pleasure, she stuck her fingers inside her quim before removing them and placing them next to her lonely backdoor. "I wonder, would my slut like my fingers toying with her asshole? Possibly even fucking it later on in the evening if we have time?"

Gleaming's eyes grew large as she thought about her... owner's fingers and cock claiming such a dirty part of herself. A thought that caused her to drip even more as she bobbed her head down Twilight's cock further than she intended, causing her to gag and pull off of the pillar of meat while coughing. "I-" she started before coughing more of her discomfort away. "-I think I'd like that, Mistress."

Twilight gave Gleaming's ass a sharp slap before replying. "Good, because once I'm done cleaning your dirty slut-cunt and whore-mouth with my cum, I'll make sure to clean the last one, too! Purify your slag ass with cleansing mare-cock! Now get back to sucking my dick, you tramp!"

"Yes Mistress, right away Mistress!" Gleaming hurriedly called before she started to bob her head up and down the magnificent pole that was Twilight's dick.

Twilight wondered if she was taking the abusive language too far, especially with her having no experience as a dom outside of reading an anonymous ancient diary that sounded like it could have been Princess Celestia dominating her little sister. Ignoring her own private musings, she went back to lapping at Gleaming's pert pussy while slowly pushing a finger deep within her big sister's behind.

Gleaming let out an appreciative moan as she continued to suck and slobber all over her little sister and goddess's perfect penis. Deeper and deeper she bobbed her head, trying to deep-throat the titanic member so as to have her sister's cleansing cum flow into her mouth. A precursor filled her mouth on one bob, the flavor of the precum passing over her tongue like the finest rosé. Groaning at the taste, she bobbed her head faster, looking to earn more of the tasty fluid.

Twilight moaned into her sister's quim and decided to use the oral technique that had yet to fail her in bringing a partner to orgasm. Granted, with Gleaming that number had grown to two. Twisting her tongue like a stylus, she started to write a message right on her slut's clit. G-L-E-A-M-I-N-G-Y-O-U-A-R-E-A-G-O-O-D-G-I-R-L-A-N-D-S-H-O-U-L-D-C-U-M-F-O-R-M-E.

Gleaming seized up as Twilight's tongue danced a message on her most sensitive bit. A message that inspired three orgasms from the desperate white unicorn. One on the 'U' of you, one on the 'G' of girl, and the final on the 'R' of for. Screeching her pleasure into her fleshy gag prevented the neighbors from checking to make sure that there wasn't a murder happening that evening. It also started an odd twitching of the pole. Gush after plentiful gush of fluid shot from her sensitive flesh as she shuddered and shook on top of her lavender sibling.

Twilight gasped out a quick "I'm cumming!" before her first orgasm of the evening hit. Her pendulous testicles drew up in her scrotum in time with each prodigious blast of off-white seed. Again and again her pillar of flesh throbbed as she offloaded a load that had been percolating all evening into Gleaming's mouth.

Gleaming had no time to savor her orgasm, realizing that if she didn't attend to the cum-spewing cock in her mouth she might end up drowning or something. So she pulled her mouth back and kept on swallowing the copiously thick and tasty loads her sister's throbbing futa-prick shot into her sucking maw. Eventually, the flow tapered off and she could savor the flavor of the thick seed. With a small mouthful left, she pulled off of her sister's damp prick and made a show of swallowing the last of her load then showing off her now empty mouth.

Twilight moved so she could catch Gleaming's lips with her own, exploring her mouth and tasting her own seed in the process. After breaking the long kiss, she smiled at her big sister. "That felt wonderful, Gleam. How'd you enjoy my special technique?"

Gleam gave her 'big' sister a shy smile. "It felt wonderful, Mistress Twilight. I'd call them the best orgasms of my life, but that describes everything about tonight. I'd like to continue if that's alright with you."

Twilight chuckled and gave her sister another kiss. "Gleaming, I'd be delighted to. Go ahead and lean back and we can continue."

Slowly, the normally confident Gleaming leaned back, spreading her legs wide in invitation of her lavender lover. "Please, Twily, fuck me!"

Twilight placed her spear at the junction of Gleaming's thighs, and slowly eased her way in, moving in to recapture her sister's lips with her own once her cock was mostly seated inside of her. Between kisses, she whispered sultrily in her ear. "Oh Gleaming! Your pussy is so deliciously tight! It's almost like it was made for me!" She started to kiss down her neck while continuing her praises. "It's so hot and wet, too! It's like it's a sauna, just waiting for me to melt into you!" Happily, she took one of Gleaming's nipples into her mouth which she then sucked and nibbled on blissfully.

Gleaming returned the kisses greedily while thrusting her hips against Twilight's driving tempo, moaning in bliss and blushing at the praises of her fur-polished pussy. "Mmmpf! Twily, I love you!" She yelled as her nipple was pleasured by her far more dominant sister. "You're so good at this! Tie me down and keep me here forever!" She began to babble. "Knock me up! Enslave me! Make me so I can't go an hour without your cock filling me!" With a few more lust-crazed cries, she came yet again, screaming into Twilight's mouth who'd had enough of her bizarre words.

Twilight smirked as she swapped between her sister's bountiful breasts, teasing and torturing them with her mouth. Hearing the craziness of her words was enough to make her smile at first, which transformed into a grin. A grin that grew as she kissed her sister deeply while breathing in her orgasmic screams. "Enjoyed that, did you?" Twilight taunted while speeding up.

"Yes Twily! I fucking loved that!" Gleaming howled back.

Twilight's hips were a blur as she pounded faster and faster into her pale sisterly lover. "Then you'll love me fucking you through my bed!"

Each pelvis-crushing thrust elicited a sharp moan of delight from Gleaming's throat, which was near constant to her delight. Her eyelids started to flutter while her eyes rolled back in her head as orgasm after orgasm washed over her, leaving her incapable of anything other than animalistic groans.

Twilight was too wrapped up in her own pleasure to notice anything other than the constant fluttering pleasure of Gleaming spasming around her cock. A lack of cognizance that finally ended with her second orgasm of the night. Hilting herself in Gleaming's still spasming twat, the violet futa finally let go and filled her sister's womb with a copious load of cum. "Fuck! Take it! Take it all you magnificent bitch!" Twilight cried in triumph before collapsing against Gleaming's sweaty body and nuzzling her.

After a couple minutes of luxuriating in the afterglow of her orgasm, Gleaming's eyes fluttered open and she smiled at Twilight's equally sweaty face. "That was fucking amazing!" She gave her sister a smirk and then continued. "Emphasis on the fucking part. You said earlier that you wanted to fuck my... slug ass?"

Twilight gave her sister a throaty laugh. "Slag ass, Gleaming. Did the other guards not use bad language in the locker room or something? Or did they not because you're a mare officer?" She reached down and groped her sister's thicc thigh while looking at her with amusement.

Gleaming's face turned red. "The latter." She looked her sister over. "Were you serious about fucking my ass?"

Twilight took hold of her loving sister's muzzle and kissed her lips deeply. "If you want me to fuck this beautifully fit ass of yours, I'd be delighted to fill it."

Turning over and slowly levering herself onto her hands and knees, Gleaming nodded. "Please Twiley, fuck my ass with that magnificent log you call a cock."

Twilight smiled before casting a spell on an already spellbinding booty. In a flash of purple magic that smelled of elderberries, Gleaming's most forbidden hole glistened in the light of the moon. "Porno Graphic the Profane's Pooper Preparation! Useful for late night anal stuffings and early morning colonoscopies!"

Gleaming let out a laugh that turned into a pleased coo as Twilight started to rub her dick between her muscular buttocks. "A bit early to think about that second use for either of us, but certainly good for what we're currently doing. So, fuck my tight little butt, you wonderfully big-dicked goddess of a mare! Fuck me hard and well enough that I have trouble sitting down tomorrow!" She flexed her dock to move her tail out of the way.

Pleased by the order, Twilight pushed Gleaming's cheeks far apart before placing her broad, flat cockhead at the ringed entrance of her butt. "Last chance to back out, Gleamy. I won't lie that I'd be disappointed to not get to deflower my sister's ass, but I'd live with it."

Gleaming smiled before taking a bite of Twilight's pillow. "Do it, Mistress! Fuck your slut's ass!" She cried out around the bit of fabric filling her mouth.

Twilight gave her an unseen nod before ever so slowly shoving her colossal cockhead through Gleaming's anal ring and into the delightfully tight and lubricated confines beyond it. Thrust after tortuously slow and gentle thrust sent her cock deeper and deeper into her Sister's bowels.

Throughout the process, Gleaming moaned like a virgin whore as her backside was raided by her sister, who she'd never call little ever again. Off-white liquid dripped from between her thighs, showing the results of her recent escapade and betraying her growing lust.

Twilight finally finished sinking her monstrous monolith into Gleaming's back door. a fact she punctuated by giving her sister's rear a slap. "Good slut! You took all of me into your perfectly whorish behind! Now, what say I really open you up?"

Gleaming squeaked around the pillow in her mouth before nodding. "Please, Mistress. Fuck my slutty ass so hard it never stops gaping!"

Twilight shook her head in amusement before slowly pulling almost all the way out before thrusting back in. "I think we'd need a nice big butt-plug to do that, my lovely slut. Would you like that? Wearing a plug all day for me so that I can pound your pretty ass with ease any time you're free?" She couldn't go quite as fast with the sheer tightness of Gleaming's ass, so settled for long, deep thrusts instead of fast ones.

Gleaming reached a hand down to her clit and started to rub at the sensitive nubbin. "I'd love to wear a plug with your mark, Mistress! I would wear it so often that it would almost be a part of my uniform!"

Twilight chuckled as her thrusts built up speed. "I'd like that. I could do surprise inspections and spank my little Gleamy slut when she's missing part of her kit. Or fuck her just like this when she's been a good girl."

Gleaming smiled at both ideas, relishing the idea of getting spanked for being naughty, or fucked for being good. "Would you really do that for me, Twiley?" She asked after letting out a loud moan.

"If we can find a mark-able butt plug, sure. I think it'd be great fun!" She panted as she thrust faster and faster into her sister's bowels. "But first, I need to finish fucking your ass for the first time!" And with that said, she focused hard on giving her slutty submissive sister the best first butt-fuck of her life.

Gleaming's tongue lolled out of her mouth as every nerve in her rear pulsed in time with her fingers on her clit. Unable to form coherent words, she hooted, howled and whinnied as her sister seemingly expertly stretched her back door. The only thing she could think to do was mash her sensitive button while meeting Twilight's thrusts with her butt as delight was etched across her face.

"Like that?!" Twilight taunted as she continued her anal assault. "Getting your beautiful butt pounded until you fall into oblivion?!"

Gleaming nodded once to answer her question before a spasm of pleasure overtook her body. With a scream of pleasure the white-furred mare's pussy detonated in orgasm! Her eyes rolled back into her head as she fainted from the rapturous feeling.

Twilight thrust into her ass three more times before her own orgasm overcame her, filling her sister's behind with spunk.

Twilight dug her thumbs into a knot on Gleaming's back as the tired mare sipped water from a glass. "Mmm, you're hired, Sis." Gleaming moaned as tension she didn't even know she was feeling released.

Twilight kissed her on the cheek with a chuckle while continuing her massage. "Sorry Gleamy, I only massage my dates. You can get me to give you another one if we do this again, though."

Gleaming smiled at the idea. "So I get to have a date with a beautiful mare, get fucked stupid, and get a massage if we do this again?" She turned and fluttered her eyes at her sister. "Why would I ever refuse?"

Twilight shrugged her shoulders while mashing a particularly stubborn end of the knotted muscle. "Well, if you were serious about that mistress talk, I'd tie you up, do more than a light spanking, and use some of the more extreme toys I've found in a catalogue." She licked her lips before continuing. "And let's not forget, you might not want to have the risk of getting pregnant by your not-so-little sister."

Gleaming looked at her sister on that last caveat with a little concern. "Uh, speaking of that risk, you did cast your protection spell, right? I might be fertile right now."

Twilight looked at her sister with concern on her face that morphed into confidence. "I admittedly forgot to cast the spell, but I know that you and I are more than capable of taking on the responsibility." A sly, lascivious look gradually took over her face. "And I know you want my foal, anyway." She gestured with her hand to Gleaming's stomach. "Just think, your belly would grow with proof of our love while your breasts inflate alongside it. The ultimate way to serve your mistress, no?"

Gleaming kissed Twilight, then nodded. "I'd love to have Mistress's baby, yes. This would be a bit earlier than I would have liked, but I wouldn't complain too much. So hopefully we aren't parents quite yet, but if we are, I'd love them and you all the same."

"I love you too, Gleamy. Now then, let's go to bed, my little slut." She turned off the light and laid down in her bed.

"Good night, Mistress!"

"Good night!"