Author's Note

At the request of 99goosebumps I have added this bonus chapter where Twilight pegs Spike, enjoy!

Bonus Chapter: Doggy Dicker

Twilight felt butterflies in her chest, she had never been an explicitly sexual girl, so approaching anything that had to do with sex always made her feel nervous and this time was no exception, she was filled with intense feelings of trepidation. All the reading in the world couldn't have prepared her for what she was about to do, she doubted there was even a book that talked about it, pegging your pet dog wasn't exactly something that had been studied extensively by anyone at that point. It had taken all of Twilight's courage but she had achieved her goal of getting her hands on a dog cock strap-on that she intended to use on her pet-turned-lover Spike, she really wanted to peg him but wasn't sure how to introduce the idea. That was when Twilight had an epiphany, dogs were bred from wolves, they had changed a lot for sure but you couldn't erase instinct! Dogs were essentially pack animals, so she figured that if she was going to peg Spike, then she could make it a dominance thing, show him that every once in a while she'd be the alpha of the relationship, it was a perfect plan!

Twilight was horny but not really horny enough that she wanted Spike to fuck her, even if she decided to blow him she wouldn't have been too enthusiastic about it, she just wasn't in the mood for it, she had waited too long to peg him and decided to bury her apprehension and just get on with it like a dominant alpha would. Spike was already on her bed which made things easy, it meant it would be a pleasant surprise when she arrived in the bedroom ready to fuck him. She squirted some lube on the strap-on, it was about average size for a dog cock, nowhere near as big as Spike, Twilight hadn't been too sure about the fluorescent shade of pink it was until she realized that she had the exact same color in her hair. After lubing up the strap-on, she slid it up her legs and tightened it around her waist, deciding to keep her clothes on for this particular session, now all she had to do was go to her bedroom, lube up Spike's asshole and pound the living daylights out of him until he came, seemed simple enough. Twilight took a deep breath, enough messing around.

Twilight made her way to the bedroom, upon hearing footsteps, Spike was already wagging his tail in excitement. When Twilight walked in, Spike was confused to see what appeared to be a dog cock sticking out from her crotch where her pussy normally was, even more bizarre was that it appeared to be on the outside of her clothes rather than under them, very confusing indeed. Twilight made her way to the bed where Spike was sitting and said "Up Spike, don't sit, be a good boy and stand up for me, come on", Spike had no reason not to obey her at that point and did as he was told. Twilight smirked, this was going well so far and if she could keep up her "no-nonsense" persona, then Spike would willingly submit to her and they'd both end up having a fun time, time to make it clear to Spike what she wanted to do with her new dick. Twilight kept it simple and reached around under Spike's tail before gently pressing at his asshole, not hard enough to penetrate, just enough that Spike might be able to comprehend what Twilight was suggesting, considering that Twilight was now the proud owner of a canine cock and was now pushing on his pucker, Spike got the general idea.

Spike shied away from her touch, he was not sold on the idea of being the bitch of the situation when it came to sex, Twilight obviously had other ideas. "Come on Spike, at least give it a try...", she tried a different approach and dragged her tongue along his rear entrance, hoping that that might entice him to assume the position. Twilight was sorely mistaken as again Spike rejected the concept, time to get nasty, Twilight adopted a stern voice and said "Spike, if this relationship is ever gonna work between us then you have got to give! Or I suppose under these circumstances, take! I'm fucking you and that's that! So be a good boy and get ready for me to penetrate your ass and show you a good time you naughty dog!" Spike whimpered and whined, though when he saw that Twilight wasn't phased by his noises, he conceded defeat and turned away from her, raising his tail and preparing to experience anal sex for the first time in his entire life.

Twilight smiled, she had asserted her dominance and now all she had to do was prove to Spike that sometimes, being the submissive one is not just very fun but also very pleasurable. Twilight squirted some lube on her fingers and started smothering Spike's asshole with it, she could tell he was still not very into this and decided he needed some encouragement, which she did by slowly inserting a finger before locating and physically stimulating his prostate. Twilight knew the prostate was a sensitive organ in the male body and it seemed that it was having the desired effect, Spike began panting as he slowly became more and more erect, by the time Twilight pulled her finger out, his tail was wagging and he was barking as if to demand that she fuck him immediately. Twilight giggled, she found it amusing how quickly Spike had changed his mind and said "Alright boy, I'm coming, I'm not one to keep a bitch waiting, so stay still like a good boy". Twilight shuffled forward and grasped onto his hips, once she had the tip of her strap-on dog dick perfectly aimed at her back entrance she leaned forward a little and started pushing with her hips to get herself inside.

The penetration was actually quite a bit easier than Twilight had anticipated, she never realized just how beneficial foreplay and preparation was, Twilight kept going until she was forced to stop when the knot of her strap-on prevented her from fully hilting in Spike's ass. She was OK with that for now, she'd worry about getting it inside later on when Spike reached a point where he could cum, this sex was all about his physical pleasure as much as it was for her own psychological pleasure and she didn't want to delay any further, which his why she reached underneath and started caressing Spike's member as she began steadily fuck him. Spike panted wildly, drooling onto the bed, his tail wagging back and forth as shots of pleasure ran up his spine every time the tip of Twilight's strap-on bumped against his prostate, not to mention a satisfying feeling of fullness in a an empty place that he didn't realized needed filling until now.

As Twilight kept up a steady and consistent rhythm, she continued to pump Spike's cock as she went "Mmmm yeah... you like that boy? Like being the bitch for once? One thing I know for sure is that if I were a real male dog I'd probably still mount you and give your ass a pounding, I may not be able to feel this but damn do I feel powerful! I've never been in charge in the bedroom before but I like it! I'm actually kind of wet, but I'm not gonna orgasm,no no no, this about you Spike, I wanna drain your balls just by jerking your cock and fucking your ass! You gonna cum for me boy? Gonna cum?" Twilight could feel Spike's cock growing in her hand, the huge bulb of his knot swelling rapidly, if she was gonna give Spike the best orgasm of his life she'd have to time things carefully, she knew the best way to tip him over the edge was to get the bulb of her own cock in his ass. She knew there was risk that she could lodge the knot in his ass a little too well and become stuck, though she figured she could cross that bridge if she came to it, time to focus her attention on Spike and the need to empty his nuts.

Twilight started putting more power behind her thrusts, intent on gradually loosening up Spike's back door until it was flexible enough to allow the knot of the strap-on to pop in, she also began stroking Spike's cock much quicker, eager to get him to his climax, her pussy was soaked so much that there was a clear patch in the crotch of her jeans that was noticeably darker and more damp than the rest of the garment. Twilight was flushed and even a little sweaty, she didn't realize just how physically taxing it was to fuck someone, she was suddenly pulled from that rain of thought when Spike began to howl, he was cumming. Almost in a panic, Twilight pumped his cock furiously and heaved her hips forward, sinking the knot of her cock into his rump, Spike howled louder as the next few shots of his ejaculation became particularly powerful. Twilight kept stroking until the last few ropes of his orgasm died off, she let go of his softening member and tugged the strap-on out of his slightly gaping asshole, thankful that it hadn't become locked inside him. She fell back on the bed in exhaustion, with Spike curling up next to her. They stayed that way until they fell into a deep sleep.

The End