Twilight tugged at her skirt, idly adjusting herself as she waited for Sunset to answer the door. As usual, she was wearing the clothes that the magic mirror had given her when she came through it. She wasn’t sure exactly where the clothes came from, and investigating it wasn’t a high priority, but she reflected on the question whenever she came to the human world.

In any case, she gathered that arriving naked in the human world would have led to a lot of unnecessary hassle. The taboo against public nudity was an interesting feature of the other world, and as usual, being here was filling her head with all sorts of things she’d have loved to read up on, if only she had the time. But she had her own world to worry about, and plenty of work to do on her side of the mirror.

So it was nice to be in the human world on a social call for once. No villains to fight, just a chance to spend some time with Sunset Shimmer. Sunset seemed to be doing great - lots of progress with none of the backsliding that Twilight was used to seeing in reformed baddies. Still, she was keeping her eyes open for red flags…

The door swung open, and Sunset Shimmer was not behind it. Instead, it was… well, the face was recognizable as Aria Blaze, one of the sirens who Starswirl the Bearded had banished from Equestria. But Aria Blaze had been a girl, surely? And this person… based on the human anatomy charts Twilight had seen, his upper body was male. Not quintessentially male. Rather androgynous in fact, but…

No, none of this mattered. There was a villain here! Potentially unrepentant, and… possibly a guest in Sunset’s home? And maybe worst of all, he was hot. The worst thing about a human body, Twilight had found, was that she had no way of predicting what she would be attracted to. The body seemed to have come pre-loaded with hormonal responses to certain body types, which had led to her crush on Flash Sentry back at Canterlot High. And now it was making her imagine what it would be like to place her hands on Aria’s smooth chest, to pull away the… t-shirt... he was wearing as a skirt and take a glimpse at the big round butt she remembered Aria having.

In time, Twilight no doubt would have shaken off her arousal and demanded to know what was going on. But Aria quickly got bored of being stared at, and called out to Sunset over his shoulder. “Yo Sunbutt! Your nerd friend is here!”

Then he turned back towards Twilight, shooting her a smug look. Twilight returned his gaze silently, warily. Aria didn’t cut a very imposing figure - at five ten he wasn’t short, but Twilight had ended up with an unusually tall human body, standing at six feet five inches. If Aria tried anything, Twilight could probably just tackle him.

Sunset, in jeans and a t-shirt, came up behind Aria - and seeing Twilight’s expression of concern, she put an arm protectively around his waist. “Hey, Twilight!” she said, forcing a smile. “Maybe I should have… uh, mentioned…” she sighed. “I think I owe you an explanation.”

“We fuck,” said Aria, leaning his body into Sunset’s. “The two of us fuck. That's the story.”

“Aria!” scolded Sunset. She stepped back, bringing Aria with her, and gestured at Twilight. “Come on in.”

Twilight grumbled as she entered the apartment, fighting through her disapproval to try and find the right words. “Sunset,” she said, “I would never try and… police your sex life. But… do you understand why this is cause for concern?”

“You know people can change,” said Sunset. “I can vouch for Aria.”

“Yes,” said Twilight cautiously. “And if you’re helping Aria adjust and live without mind-controlling people or drinking their negative emotions, that’s a good thing. But you didn’t tell me about it, and that makes me think you have something to hide.”

Sunset backed into her couch and sat down, and Aria took a seat on her lap. He didn’t seem all that concerned with the conflict that was simmering between Sunset and Twilight; he lounged casually on his girlfriend’s lap, softly grinding his bubble butt against her crotch. A stiffening cock wasn’t helping Sunset focus, but having Aria close was comforting.

“This thing started out as attraction,” said Sunset. “It wasn’t… rational.”

Aria smirked at Twilight. “I think what Sunset is trying to say is, she-” He stopped and furrowed his brow, then whispered a question into Sunset’s ear.

“Yeah, she knows,” said Sunset.

“She saw my juicy ass and she just had to bury her cock in it,” said Aria, grinding his cheeks deep into Sunset’s crotch. “And after that, she decided to take me on as her boytoy and her little project. She’s the reason I’m so fucking nice now.”

“You’re not a project,” said Sunset, rubbing the back of Aria’s neck. She turned to Twilight. “And I think you’d approve of the way I’ve worked with the sirens. They’ve never really been forced to form emotional bonds with anyone outside their trio. And now that they are… well, friendship is starting to work its magic, you might say.”

“That’s it exactly,” said Aria. “You girls broke us down, made us powerless, and now Sunset is remaking us in her image. Super cool methodology, horse princess.”

“Now is really not the time for your fucking attitude, babe,” said Sunset mildly.

Twilight cut in, fists clenched at her sides. “I asked you to tell me if you encountered the sirens again! And you said you would! How long has this been going on?”

“A couple months,” said Sunset. She put her arm back over Aria’s chest, drawing him close to her.

Twilight blew out a long breath. Aria hadn’t seemed at all put off by her outburst - he was still grinding his ass into Sunset’s crotch, and Twilight couldn’t help but stare. She’d seen Sunset’s dick, every inch of that hot human cock, during her second trip to this world. The morning after the sleepover at Pinkie’s house, Twilight had walked in on Sunset coming out of the shower. Sunset had tried to play it casual - they were both ponies, really, she’d said. And if they’d seen each other naked in Equestria, it would have been totally normal.

But this wasn’t Equestria. And maybe it was something about her human hormones, or the context of a society where nudity was taboo, but seeing Sunset naked was pretty hot. And the thought of her burying her cock in her boyfriend’s bubble butt, and blowing her load deep in his ass, was incredibly hot. And she was having trouble thinking of anything else.

“Look,” said Twilight, “I understand having… a night of passion. A week of f-furtive lovemaking, a… a tantalizing secret romance…” Urgh, thought Twilight, Why am I composing a blurb for a romance novel? “But at some point you should have told me!”

“I’m telling you now!” shouted Sunset. She grunted in annoyance at herself. “No,” she continued, “You’re right. I should have told you… because… you helped me, and you’ve been honest with me… I’m sorry, Twilight.”

Twilight let her fists unclench, and walked over to the couch where Sunset was sitting. “Well… all right,” she said. “And I do approve of you taking this sort of thing into your own hooves. Helping people the way I helped you. Even if your approach is different.”

“I think Twilight sounds a little jealous,” said Aria. “When she helped you, all she got was a nice feeling of superiority. But you got a boy who loves to suck cock and get fucked.” He turned his body to the side, draping himself across the length of the couch, setting his ankles on Twilight’s lap. “What would you do with me if you had me to yourself, Twilight Sparkle?”

“I don’t really know,” said Twilight. “Maybe see if I can convince you to act nicer?”

“Oh, Sunset and I have a system for that,” said Aria, kneading Twilight’s thighs with the soles of his feet. Whenever I’m too much of an intolerable little brat, she bends me over and fucks the attitude right out of me. It’s a great incentive to stay in line.” He rubbed his ass against Sunset’s crotch again, feeling her hard shaft against his plump cheeks. “As soon as you leave, she’s going to be very rough with me, because I’ve treated her guest so rudely.”

“Might not even wait til Twilight leaves,” said Sunset, leaning back into the couch as Aria stroked her through her jeans. “If you’re going to be such a wanton slut in front of her, talking about my cock, maybe she deserves to see your femboy ass made humble.”

Twilight, confronted by the possibility of actually seeing the two of them fuck, was almost breaking out in a sweat. It didn’t seem appropriate to say that yes, she would be all right with seeing that… but she definitely wasn’t going to tell them to stop.

“Now that would be a proper introduction,” said Aria. “She can hear how I squeal when my girlfriend’s big fat cock fuckin’ penetrates me.” He lifted his head and rested it against Sunset’s tits. “Or maybe she’d like to get involved. Maybe spank my ass while I suck your cock, baby?” He turned his head slightly, shooting a smoky look at Twilight. “I see you trying to get a better look at my ass, Twilight,” he said. “I bet you’d love to see how it jiggles when you smack it.”

“Gah…” sputtered Twilight.

Sunset burst into laughter, and Aria joined her. “Okay, Aria,” said Sunset, “I think we’ve teased Twilight enough. And if you keep grinding your ass into my crotch, I’m seriously gonna cum in my pants.”

Aria, maintaining eye contact with Twilight, ground his butt harder and deeper into Sunset’s groin. “Oh, I’m not done teasing,” he said, rubbing his head against his girlfriend’s tits. “I decided I wanna make you cum in front of your repressed nerd friend.”

“Oh fuck you, Aria,” said Sunset. “You know I really will punish you for this, right? I got a real short refractory period, little man… I will make you fuckin’ squeal…”

“Promises, promises,” said Aria. “Ooh, that powerful cock is bucking like a bronco. Sunset’s about to cum, Twilight. I know this feeling. She’s right on the edge…”

And then Aria stopped and rolled his body off of Sunset, taking a seat between her and Twilight. He stretched his arms and put them around the two girls - Twilight, who was sweating and shaking in her seat, overwhelmed by what she’d just seen - and Sunset, who was moaning in anguish as her climax receded.

“Oh, fuck,” groaned Sunset, “You can’t do that to me, Aria! Leave me with blue balls… I’m going to actually fucking punish you for this. Throw you off the goddamn roof…”

“Don’t worry, Twilight,” said Aria, “She’s not really gonna do it. She’s addicted to this ass.” He leaned closer to Twilight and lowered his voice to a whisper. “These former villains, you know… you gotta keep ‘em in line somehow.”

Author's Note

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