Back in her room, she put all the pieces together, female perspective, male perspective, subject perspective, it all pointed to one thing. Her father's ideal fantasy girl was someone who acted clueless, had a massive rear and in an odd twist, no vagina at all, but rather a big cock and a set of fat heavy testicles, looks like she'd have to take it in the ass on this occasion. Before she made her dad's dream babe a reality, Twilight had to make sure her mom wouldn't get in the way first, she called up Cadance to ask her if she'd be able to distract her mom by taking her clothes shopping or something. Cadance happily agreed once Twilight admitted it was so she could have sex with her father, Cadance was extremely liberal when it came to sex and even actively encouraged her to follow through with her plan. Once that was out of the way, Twilight thought about the perfect look to adopt and after taking off her regular clothes, she went to her mirror before conjuring up a costume piece by piece. First of all was a pair of white panties with blue, pink and yellow stripes, the perfect mix of sexy and cute, she decided against a bra. Going with a school girl look, she added a short tartan skirt that only just covered her panties at the front but covered almost nothing at the back, a simple white short-sleeved shirt with enough buttons undone that it showed a bit of cleavage, short white socks and black shoes, then topped it all off by doing her hair in a ponytail with a ribbon the same color as her skirt.

Twilight looked herself up and down in the mirror, it was perfect. Doing a silly air-headed girl act would be easy, cruel as it sounded, she figured she'd just act like Pinkie Pie for that, all that was left were the physical alterations. Twilight lit up her horn and focused the magic around her buttocks, after the flesh rippled slightly it expanded into a respectable set of cheeks, plump, smooth and just begging to be touched. Twilight looked at her new behind, she bounced herself up and down and watched the cheeks jiggle, Twilight lit her horn back up, her ass was good but not quite enough for her tastes, or rather, he father's tastes. After her cheeks once again increased in size, Twilight looked at herself in the mirror again and upon bouncing herself up and down, she was able to make her ass clap rather impressively, now she was getting somewhere. Satisfied that she had enough junk in the trunk, Twilight moved onto the new addition, a task she felt a fair deal of trepidation about, a cock and a pair of churning nut sacks to go with it.

Twilight took a deep breath then let it out again, increasing the size of a body part was one thing, but changing her anatomy was going to be slightly trickier. Twilight relaxed herself, concentrated then lit up her horn to start working some magic around her groin, her ovaries, womb and vagina all rippling as they slowly shrank until simply ceasing to exist in order to make way for the new equipment. After a second or two of being as smooth as an action man in between her legs, a fully operational dick and balls began to emerge and take their place right where Twilight's pussy had once been. Sweating and breathing heavily, Twilight relaxed as she finished crafting an accurate package, only to find herself somewhat disappointed when checking herself out in the mirror. It wasn't that the new genitals she had acquired were too small, but rather they were just kind of average, Twilight wanted them to be a little more like the ones in the animations her dad watched whenever he had time to jerk himself off. Lighting her horn back up one more time, she began enlarging her endowment to a more suitably erotic size, when they were large enough that they started to strain slightly against her panties, Twilight took another look and smiled, huge cock, huge balls, huge ass, school girl outfit... all she needed to do was adopt the right personality and her dad would be in heaven.

Twilight was glad she had made her physical alterations a couple of days before she intended to visit the house again for the main event, her larger backside took a little getting used to and the male genitals she had given herself flooded her body with hormones that her brain wasn't used to dealing with. The day arrived and Twilight was ready to see if her plan to entice her dad enough to fuck her would work, she went to her house in full costume and relaxed as she put on the innocent dumb girl persona she had been working on. As expected her father opened the door and was instantly confused when he saw his daughter, or rather the fact that his daughter was stood there with a big grin and a ridiculously provocative school girl outfit, not her usual choice when it came to appropriate attire for a visit.

Twilight giggled and went "Hiya Daddy! Can I come in?"

Night Light went "Uuhh...... suuuure I guess?"

Twilight jumped and drew her father into a tight hug as she went "Yaaaay!" Night Light had no idea what was going on as he saw his daughter skip to the living room, as a father, he felt he needed to address the issue in case this was some kind of crisis that Twilight was going through that had somehow broken her mind.

"Um... Twilight, are you feeling OK? You don't quite seem yourself..."

Twilight, keeping up the act went "Well sure I am daddy! I'm only like this for fun later ya big silly!" Night Light assumed that the "fun" in question was probably a costume party and, for whatever reason, Twilight had decided to stay in character before the party had even begun. Night Light decided not to dwell on it and sat down on the couch next to her before going on his phone, trying not to pay too much attention to this alternate version of his daughter, if Twilight intended to seduce him then she needed to think of a way to send a clearer message and get him to notice her in a sexual way rather than a parental way. A minute or so passed in silence before Twilight thought up a plan to show off her body as explicitly as possible, she didn't have all the the time after all, she skipped to the kitchen humming a tune to get a glass of water, if she did this right then sex with her dad was guaranteed. When Twilight went back into the living room she put the glass of water down and "accidentally" spilled some of it on the table, Twilight feigned surprise and went "Oopsie! Sorry Daddy! I spilled my drink! Let me deal with that..."

Twilight picked up some tissues and bent over directly in front of her father to clean up the water she had spilled, it was perfect timing as well because Night Light chose that moment to look away from his phone to see what Twilight was doing, only to be faced with a his daughter's gigantic ass. Night Light was transfixed, his eyes wide and mouth agape, he could already feel himself getting harder the longer he looked at the magnificent rump in front of him, unable to tear himself away as if he were somehow hypnotized. Twilight had to hold back a smirk as she felt her own cock hardening and decided to part her legs a little more, allowing her fat nut sacks to become visible from behind, knowing that her father was bound to notice considering that he was a sucker for futa hentai. Meanwhile, Night Light didn't think his eyes could get any wider as he noticed the very obvious bulge of two pendulous balls filling out what little space there must have been in her panties, was he dreaming? If he was dreaming then he didn't know if he wanted it to end or not, he was conflicted because on one hand he was basically ogling his daughter but on the other... his daughter was perfectly pushing every single button and ticking every single box in the part of his brain that stored the important information of things he found undeniably sexy.

Night Light stutter as he went "Um... Twilight d-do you h-have a... a er...", he struggled to bring himself to ask the question.

Twilight went "A what daddy?" She shook her behind a little before deciding that this particular tease was over and as she turned around she once again "accidentally" spilled the rest of her water, this time spilling very conveniently onto her dad's crotch. Twilight gasped and repeated herself when she said "Oopsie! Sorry Daddy! I spilled my drink! Let me deal with that...", as Twilight grabbed another bunch of tissues and started rubbing at her father's concealed cock, she was surprised but glad that he still seemed to be in too much of a state of shock to be doing anything to stop her from getting him fully hard so that she could segway naturally into some daddy and daughter fun time. Night Light was struggling to comprehend the chain of events effectively to react, it was only a few seconds later that he was able to come back to his senses when, upon reaching a full erection, Twilight gave a girlish giggle and said in a sultry tone "Oopsie, sorry daddy, I made you super duper horny...... let me deal with that........."

As Twilight started pulling down his zipper, Night Light clasped his hand on her wrist and went "Twilight... I... no, we shouldn't.... I mean we can't... I... I..."

Twilight rolled her eyes and slapped his hand away as she said "Aw come on daddy, don't you want me to put your thingy in my mouth and suck on it like a big ol' tasty lollipop?" Twilight didn't wait for her father to answer as she continued undoing his pants before eagerly tugging them down along with his underwear, his cock finally springing free of the fabric of his clothing and into the open air. Twilight felt her mouth water the second she finally laid eyes upon her dad's pulsating prick, if this blow job didn't make him nut then he'd practically be begging to bang her booty afterwards, with how hard her own equipment was, Twilight was certain that she would cum if someone sucked her off at that moment. Twilight leaned forward and elegantly slipped her father's cock into her mouth, the taste was interesting but definitely good and Twilight couldn't help but hum in appreciation as she descended and constantly swirled her tongue around every inch of cock it could reach. As Night Light groaned and placed a hand on Twilight's head, she shuffled her panties down to free her own erection, before reaching into her sock where she retrieved a well hidden condom packet, which she tore open to immediately slide the condom onto her dick, her cock wasn't long enough to reach her mouth and she didn't want to make a mess when she came or to try and magically elongate it halfway through sex.

A few seconds passed until Twilight had managed to effortlessly take her dad into her throat, her nose pressed right up against his groin and her chin resting comfortably on his pent up cum factories. After letting her dad's cock sit in her mouth for a while, she moved back up until just the tip was left poised right at her full luscious lips, then plunged herself all the way back down, repeating the motion several times and getting into a consistent and very pleasurable rhythm of deep throating her father's cock over and over and over again. Night Light groaned, his wife always gave him a great blow job but Twilight was on another level with the way she expertly used her moist silky mouth to please him, though it did make him wonder how his daughter had gotten so talented and hoped that she was just naturally gifted rather than the alternative "practice makes perfect" way she could have become good at sucking dick.

Twilight wished she could have just blown her father for the next hour or so, it was weirdly therapeutic to voluntarily violate her own throat with a thick throbbing cock, but this cock had other places to go and so she reluctantly ceased her blow job and replaced it with some gentle stroking to make sure her dad stayed hard. With how horny her father was if the beads of sweat rolling down his face and heavy breathing were any indication, Twilight felt reassured that he would definitely still be at full mast and ready to fire on all cylinders as she moved on to the main event, releasing his cock and simply standing up, preparing for the final tease. Twilight smirked and said "So daddy... did you notice that I've got this super big dick and a pair fat heavy cum-filled balls?" Twilight giggled as she waved her cock from side to side, seeing her dad follow it's sway with his eyes and dumbly nodding like he was in some sort of trance that had been induced by a futa succubus version of his own daughter.

Twilight pulled down her skirt and turned away as she said "You didn't forget about my round jiggly ass though, right daddy?" Twilight bounced up and down, making her ass clap loudly right in front of Night Light's face, Night Light himself was surprised he hadn't already busted a nut right then and there, who cared if she was his daughter? She was fucking sexy and Night Light was desperate to just go to town on her perfect body as soon as possible. Twilight moved back and wedged her father's dick in her crack, grinding up and down as she leaned her body back into his, tenderly licking and nibbling at his earlobe before adopting a needy tone of voice and huskily whispered "Do it daddy... claim my ass and make it yours, I'll even let you cum inside... please daddy I want it so bad, I need it... maybe next time I'll even let you inside my tight, hot, wet and aching little pussy......"

Night Light couldn't hold back any longer, the promise of young pussy was too much. Night Light wrapped his arms around Twilight and grabbed onto her tits, as he shuffled his hips around to try and angle his cock at his daughter's ass hole. Twilight was more excited than ever as her cock throbbed with anticipation, she was glad she'd had the good sense to stretch her ass out a little before enacting her plan to seduce her dad because when he found her entrance, he pushed in hard and wasn't going to stop until he was fully inside her. When Twilight's ass as finally pressed up against her father's crotch with his cock being hugged tightly by the warm walls of her insides, there was a pause and a moment of silence before Twilight began gasping and moaning as her father gripped her body tightly and began hammering away at her butt like there was no tomorrow. Twilight instantly had to wrap a hand around her cock and start jerking off as she felt her rump being repeatedly filled as her father railed her behind, this was going better than she had ever hoped, the only problem however was her own endurance.

Twilight had yet to actually use her new addition, her pussy was well trained to hold off an orgasm but her butt was especially sensitive and could trigger an orgasm immediately, one of the many reasons she only ever played with it occasionally and trying to train it to not be so sensitive was a futile effort because she always came before she could make any progress. Since her pussy was currently missing in action, the orgasmic power had to go somewhere and Twilight practically screamed "OoOoHh FUCK DADDY OH FUCK YES! AhHh.." as she experienced her first male orgasm, her balls tensed up and her cock pulsed as she filled the condom she was wearing with a fairly substantial load. Night Light chuckled as he saw his daughter covered in sweat, tongue lolling out of her mouth and whimpering as her cock softened up but remained semi-erect from the continuous ass pounding he was still delivering, he increased the speed and strength of his thrusts as he said "Bit of a quick shot there honey? You need to work on that, I've got years of experience so this could go on for a while!" Night Light talked a big game but in reality was bullshitting a bit, his wife only allowed anal sex on special occasions like birthdays, hearth's warming eve and even nightmare night, so his body was used to experiencing the comfort and warmth of a ready and willing booty more than three times in a year.

A couple of minutes went by as Night Light grunted and groaned, pushing himself to go harder and faster the more time went on, ramming his daughter's bottom with all his might. Twilight made an unintelligible babbling noise as once again her balls were emptied, the remainder of her spunk joining it's predecessor in the condom which slipped off of her completely flaccid dong and onto the floor just seconds before Night Light made a similar guttural noise as he drained his own balls deep inside Twilight's rear. While Night Light's dick began to soften, they both stayed in place, panting and exhausted. Twilight thought about Rainbow Dash and how she needed to thank her, she never would have fucked her dad if it wasn't for her and Twilight was already preparing for next time.

The End.

Author's Note

Thank you UndeadMan for this story idea! I hope you enjoyed it :)