Selfcest is Best -cest, feat. Dusk and Femanon (requested)

>Morning in Golden Oak Library.

>You woke up to an empty bed, Twilight already in her lab.

>She had recently broke down the walls to another world, and met her stallion counterpart.

>It was conversations only, as the physical barriers were still there. They could see each other, talk to each other...passing through was the only task left.

>An alicorn himself, he was also significantly taller than Twilight. Roughly as tall as Shining Armor was, actually.

>His name was Dusk Shine, student of Prince Solaris, and fiance to Femanon.

>Accidentally on Twilight's part, the walls came down while he was was busy being 'intimate' with Femanon.

>Dusk and Femanon, naturally, freaked out and fell off his bed.

>You'd have done that too.

>It had been about a week or two since then, the two alicorns attempting to find a way to break through to the other side.

>You and the other human were happy to leave them to their own devices, as long as they didn't starve themselves doing it.

>You both had dragged off your respective pony when it came time for dinner or bed.

>Going into the kitchen, you grabbed some pans to make yourself breakfast.

>Spike was out getting groceries.

>Then you heard it.

>Twilight cheering.

>"Yes yes yes yes yes yes yes yes yes!"

>Arching an eyebrow at Dusk joining in with his deeper tone, you went downstairs.

>Which is when you saw Dusk Shine standing in the library's lab, giving Twilight a hug.

>A female human was also standing nearby, grinning widely.

>"I can't believe we did it!" He half-shouted in excitement.

>"I TOLD you that casting the same spell at the same time would do it!"

"Uh...?"

>"Oh, Anon!" Twilight said, turning to give you a bright smile.

>"Look what Iiiiiii diiiiiid~!" The mare continued in a sing-song.

>"This place is fantastic, I'd have never dreamed of having a laboratory this wonderful!" Dusk said, looking around at the lab.

"Don't you have a lab?" You asked. "I mean, it's a mirror universe, you should have what she does."

>The stallion huffed.

>"I DID have a lab at one point. Rainbow Blitz felt the need to obliterate my lab 'as a prank' a year ago."

>"I made sure he, ah, regretted it." Femanon continued, crossing her arms and huffing.

"Ouch."

>"Yeah."

>Twilight, meanwhile, was writing down exactly what she did to make this work in a notebook.

>Closing it up, she then affixed them both with a sunny smile.

>"Come on! I want to take you two on a tour!"

---

>The tour of Ponyville went exactly as you figured it would.

>Seventy percent of Ponyville consisted of mares. For a stallion like Dusk? He was in *heaven*.

>He was constantly looking around for maybe that errant tail flick or the pegasus flying over.

>Dusk was a total pervert.

>Nearly brought a tear to your eye in pride.

>Femanon chuckled the first time or two she had to bring Dusk's attention back.

>She wasn't quite as nice the next few times, slapping the stallion in the back of the head.

>He nearly had a heart attack when he was introduced to Twilight's friends.

>Apparently his own friends were almost one-to-one with Twilight's own, the only difference being they were stallions, not mares.

>You four went back to the library, passing by Spike who was off to help Rarity.

"That dragon has to be getting some sort of high off of that mare, Twilight."

>"Hmm. Barb is much the same way around Elusive, you may be on to something." Dusk replied with a chuckle. "In fact, seeing as I'm not home, she may have excused herself to go work with him for the day."

>The four of you quickly found yourselves back in the lab, Twilight still excited like a filly.

>The two talked into the night as you and Femanon quietly sat nearby.

>Every time one of you tried to reply to a question, your significant other cut you off.

"Well, I mean, if you two know so much, we'll just be back here then." You replied after the third time straight that Twilight had cut you off.

>The two alicorns didn't hear you.

>They were doing more than enough talking for the two of you, content with bouncing questions off of one another.

>Soon enough, however, Dusk and Femanon had to go home.

>This particular portal could only stay open for so long, before it had to be closed and re-opened.

>Issue was: It had to be opened from both sides simultaneously, otherwise they'd be trapped here.

>They were both working on a way to keep it open permanently.

>Bidding them farewell for now, they hopped back through to their side.

>The rift closed a few minutes later.

>Twilight sighed happily, having made two new friends.

>"I think today was good, Anon. Met some new friends, got plenty of information about the other side, and my own friends got to meet them!"

"Heh, yeah. I think Rarity was a bit smitten with Dusk."

>Twilight giggled musically, before affixing you with an odd look.

>"I just have to ask...why weren't you two talking to each other?" Twilight asked you, cocking her head curiously to the side.

"Hmm?"

>"I mean, there had to be plenty you two could have learned from the other."

"We would have, had you and Dusk not done that for us." You said with a wry smile. "Nothing to talk about when two brainy ponies are comparing notes on their favorite bipedal species."

>"...oh, right." She said with an apologetic grin. You ruffled her mane.

"No harm, no foul."

>You settled into bed, Twilight joining you moments later.

"G'night, love."

>"Night night, Anon."

>Her lips graced your cheek, and you were out like a light.

---

>Dead of night, and you suddenly couldn't sleep.

>Mostly because Twilight, who had been nestled against you, had vanished.

>You think you knew where she went, too.

>You crept down the stairs to the lab, which was lit by candle.

>"Now, tell me." Dusk asked. "How is he in bed?"

>You could *hear* the mare blush.

>"He's amazing. Lasts for almost an hour, far longer than I can."

>Twilight giggled.

>"I think Anon's broken my 'want' for any other stallion. They just...can't compete."

>Dusk chuckled.

>"What about her?" Twilight asked.

>"She doesn't last quite as long." Dusk said with a prideful smile. "I need copious amounts of lubrication to fit inside her, too. Once I do though, neither of us lasts too long. Her tongue though, by the Prince, she's *good* with her tongue."

>You quietly hid in the stairwell, watching the two.

>"She's too small?"

>"Her vagina isn't equipped to handle eleven inches, no." Dusk chuckled. "We're both satisfied at the end, though."

>Twilight's eyes widened.

>"I don't think *I* could handle that either."

>Dusk coughed.

>"Well, I mean...we could try. As an experiment."

>Twilight arched an eyebrow.

>"Wouldn't that be cheating on our humans?"

>"I call it masturbation. You're me, right?" Dusk replied almost instantly.

>Twilight looked conflicted, until she looked at the stairwell and saw you grinning like a fool.

>You mouthed the words 'for science' to her, and she slowly went from shocked she got caught, to shoving Dusk onto his back.

>Besides, like Dusk said: Technically speaking, it was masturbation.

>You were pretty sure Femanon would like the occasional show now and again as well.

>In fact...looking over, she was in Dusk's lab, looking through the portal.

>Clothes off completely, apparently Femanon liked to sleep in the nude.

>You didn't blame her, pony coat felt amazing on skin. You were in only your boxers for that very same reason.

>It was funny though. Despite there being a naked human female literally right there, you didn't really react.

>May have been because you recognized her as, well, you.

>May have been because you were loyal to Twilight.

>Shrugging silently to yourself, you simply...watched the show.

>Twilight levitated a condom out of a nearby desk.

>A hold over from the first time you two had sex during her season.

>As it turns out, stallion condoms were much too big for you. Go figure.

>Simple genetic incompatibility to the rescue.

>"If we're doing this, you're wearing this." Twilight said.

>"Aw man, Femanon says that to me too. You're both no fun." Dusk pouted.

>"It's this or nothing. I don't want to clean my own semen out of me."

>She paused.

>"That was...an awkward sentence." The mare continued, blushing.

>"Fine, fine." Dusk relented after a moment.

>Twilight lifted her tail and gave the stallion a short show, enough to get a rise out of him.

>The mare's ears went flat and eyes went wide when she looked at her 'handiwork'.

>"D-Dusk, you're h-huge..."

>"Told you." The male alicorn grinned.

>Slightly stunned, she slid the condom over the head and down the shaft.

>"Oh, this is one of those...enchanted ones, isn't it?" Dusk choked out.

>Twilight nodded mutely, then yelped as Dusk reversed their positions.

>Twilight was on her back, with Dusk ready to penetrate.

>A blush was lighting her cheeks.

>"This is so wrong..." Twilight mumbled.

>The mare cried out as the stallion slid himself in.

>He got in halfway before he stopped, gone as far as he can.

>"L-like a glove~" The stallion quipped, giving Twilight a short kiss on the nose.

>"Dusk, oh woooow..." Twilight groaned, exhaling heavily.

>Chuckling, the stallion wound back, pulling out of Twilight a bit.

>"Hold...still..."

>"I can't...go anywhere!" She snapped, still coping with her copy deep in her.

>He thrust once, his eyes rolling back.

>Twilight clenched her eyes shut, wings flared out wide.

>She was quietly mumbling 'this is wrong' over and over, but was still not pushing him away.

>Dusk, meanwhile, was mumbling 'this is awesome'.

>Dusk hilted again, and Twilight moaned throatily.

>The stallion started a slow rhythm, Twilight's eyes shooting open after a bit and hooves grabbing around his back as she came, the fluids flowing out of her spread slit and onto the lab floor.

>The mare quickly changed her tune.

>"Don't stop, whatever you do!"

>"Thought Anon ruined you for any stallion?" Dusk chuckled.

>"You're me, you don't count!"

>Dusk chuckled again, then froze as Twilight pulled herself up, tapping their horns together and holding them there.

>A magenta light started building up, then died out as it looped back into the stallion.

>The light built up again, feeding back into the mare.

>They both cried out, before silencing one another with a lip-lock.

>Dusk grunted and pulled away.

>"T-Twilight, I'm gonna...blow..."

>So soon? Dusk wasn't kidding about the 'no stamina' thing.

>Twilight couldn't respond, her jaw was hanging slack and eyes unfocused. Her wings were at full mast, ears pinned back.

>Dusk then slowed down, making slow, deep thrusts into the mare.

>You could hear the splatting of fluids in her uterus, even from as far as you were.

>Twilight's pupils shrunk to pinpoints as she suddenly came back to the land of the living.

>"H-hot...? I shouldn't be...oh no..."

>You watched the mare's belly distend a small bit, before Dusk pulled out.

>A wave of her cum and his semen followed, the condom itself torn open.

>"Oops."

>"Dusk..." Twilight started, low and dangerous. "You are so lucky I'm not in season."

>"Aww, you can't tell me you didn't like it though."

>"That's the ONLY reason I haven't shoved you back through your portal." Twilight replied, a furious blush lighting her cheeks. "By the way, your human was watching."

>"I know she was. She's the one that put me up to it."

>Twilight blinked, then looked back to you on the stairs. You flashed her a thumbs up before you and your counterpart lost it.

>"...th-they're the same." The mare said after a moment. "We're both about to marry absolute perverts."

"Says the one that just boned her copy!" Both you and Femanon shouted at the same time, laughing like fools.

>Dusk was laughing in kind, Twilight was just trying to hide herself out of embarrassment.

>You walked down the stairs as Dusk jumped through the portal, it sealing behind him.

>Twilight wasn't looking at you.

>"I'm sorry."

"...for?"

>"Cheating on you."

"Was that cheating? I only saw some creative masturbation." You said with a grin.

>Twilight's furious blush returned.

>"I'm going to get you back for this." She said, her hindquarters still dripping.

>You laughed all the way back to bed.

"How many fetishes is that now, Twi?" You asked with a playful chuckle, running a finger around the spirals of her horn and down her back.

>She paused for a moment to shiver in delight, both glaring daggers at you and seriously thinking about it.

>"...strange ones, or semi-normal ones?"

"Strange ones."

>"Uh...that makes seven, I think. Selfcest was...not one I thought I would add, but there it is."

===

>A week had passed since Dusk and Twilight had their 'intimate meeting'.

>They had both talked since then, but pointedly avoided the subject.

>They had also both stabilized the portal, so now it could stay open almost permanently.

>You and Twilight were visiting Dusk's side today, helping him put up a new lab with equipment from Twilight's side.

>There was quite a bit of heavy lifting, even with two alicorns. You all could only do so much.

>Once done, you all were taking a load off upstairs.

>Twilight and Dusk were lounging on their respective human's lap, teasing the two of you with the occasional tail flick or breast nuzzle, depending.

>The two ponies locked eyes, then nodded to each other.

>You gave Twilight a curious look.

>She, in return, gave you a wolfish grin.

"What, Twilight?" You asked, a question Twilight didn't respond to.

"Duskie, what are you doing?" Fem asked, to similar silence.

>"This," They both answered simultaneously.

>Your shorts came off and Twilight's mouth wrapped around your member.

>Lil' Anon came to attention in a hurry, Twilight's tongue coaxing and teasing him.

>Fem yelped when Dusk put his horn in her slit, the contours of his horn causing her to grab the back of the stallion's head.

>You watched his horn light up as she forced the rather sharp horn in deeper.

>"So glad I invested in this protection spell..." You heard him mutter as he grinned at Twilight.

>You reached around and plunged two fingers into your mare in retaliation, Fem following suit by giving Dusk a handjob.

>The two ponies were quickly ready as well, which is when you switched it up with Twilight.

>You practically threw her back on the couch, lining up on her pussy.

>Dusk quickly wised up, and did the same to Fem.

>You both pushed into your respective female, both of them groaning in pleasure.

>Twilight and Fem locked lips, kissing the other deeply as you and Dusk ruined them.

>Surprised, but not shocked, that she was a little bi, you continued to rail your mare into the couch cushions.

>Dusk managed to hilt as you hilted into Twi, the two females crying out as they held onto their mate.

>Twilight looked over to Fem, giving a curious look at her breasts.

>"W-why ar-are they the-oh Celestia, don't stop!" Twilight said, about to ask a question but abandoning it halfway.

"Twilight, hush up." You replied in a soft-hearted demand.

>You then guided her mouth to Fem's breasts, Twilight's lips seemingly automatically locking onto the closest one.

>Fem, in turn, began licking and sucking on Twilight's horn.

>A light began building up on Twilight's horn as the mare's eyes clenched themselves closed.

>The clenching grew tighter the brighter the light was, and eventually her teeth were clenching together as well.

>Twilight's vaginal muscles were going wild on your dick, milking you for all you were worth while at the same time trying to keep you in.

>"I-I'm gonna cum~!" Dusk shouted, pulling out.

>He pulled Twilight's mouth off of Fem, shoving his cock into Twilight's mouth.

>Fem continued sucking on and licking Twilight's horn as Dusk came down the mare's throat and into her mouth.

>Twilight offered only a single sound of shock before she drank it down, the stallion pulling out a few seconds later and patting the mare on the head.

>You, meanwhile, were just about done yourself.

>Pressing deeply into Twilight's cunt and grabbing her flank tightly, you felt her jump in shock.

>The light from her horn grew blinding, until it suddenly vanished.

>"Aaaaaahahaaaa~!" Twilight cried out, more of a choked laughing sound than a moan.

>A strange magenta gel splatted into Fem's mouth and all over her face, some of it sizzling away on her skin almost immediately.

>Most remained, however.

>You gave Twilight's flank a swat or two, then came deep into her honeypot with a groan.

>Twilight's back arched reflexively, the mare groaning tiredly as her abused body strained to keep up with all the pleasure.

>The four of you slumped over onto the couch, one after the other, completely spent.

>You pulled Twilight close to you as Fem did the same to Dusk, both of you snuggling with your respective pony.

>Dusk idly stroked both girls' pussies with a hoof, getting an appreciative moan. You followed up with a single finger stroke between the lips, both girls groaning deeply.

>"That..." Dusk started, unable to really speak as he blushed like a fool.

>"...was amazing." Twilight finished, a healthy blush on her own cheeks as your fingers idly explored inside her and Fem.

>Fem yelped, thighs closing around your wrist as you teased her G-spot.

"D-Duskie, you need fingers!" Fem shouted as she came on your hand.

>Twilight groaned, marecum liberally leaking from her cunt.

>Dusk was hard again, watching both girls cum at your touch.

>"Tw-Twilight, I want to mount you again..."

>"You better cum in me then...I don't want to mess this couch up..."

>Dusk nodded, his horn lighting up again before the glow vanished.

>He slid deep into Twilight's honeypot as you let Twilight distractedly lap at your cock.

>Fem took it a step further by sitting in your lap and impaling herself on you, Twilight's tongue instead wrapping around Fem's throbbing clit.

"Ah, this feels riiiight~!" Fem moaned, bouncing in your lap as you closed your lips around Twilight's.

>Fem went back to sucking on Twilight's horn as Dusk slammed into the female alicorn from behind.

>Dusk cried out, followed by Twilight gasping.

>The mare's womb stretched as you could *hear* Twilight being filled with pony cum.

>"D-Duuuusssk~!"

>Twilight's horn was glowing brightly, and Fem pulled off of you and shoved Twilight's horn into her slit.

>Twilight blew again, Fem crying out as that purple gel flooded her. Fem looked several months pregnant at the end, panting happily.

>You were the only one who had yet to get off.

>"Here, Anon..." Twilight mumbled, opening her mouth.

>You grinned and put your dick in Twilight's mouth, happily groaning as Twilight's tongue helped you out.

>Grabbing her horn. you shoved yourself deep down her throat before cumming hard on down it.

>The mare gurgled lightly before falling over, a tired smile on her face.

>"Mmmmhmhmmmm..." She hummed, Femanon joining her in her slump.

>You and Dusk took your appropriate girl, holding them close.

>Twilight was asleep in your lap, dripping from every hole. You didn't care, as you had put most of those fluids there to begin with.

>She pressed her back into your chest as you fell asleep, providing a comforting weight.

>Oh, the entry she would have for the friendship journal today...