I belive a strap-on was mentioned

Hailey leaves the former boy panting like a stranded fish while she digs into a battered suitcase.

"Her she is!" She announces flourishing a monster dildo, "I didn't expect to be needing this on my first day but, you know what they say, be prepared!"

Carla goggles at the huge rubber phallus, half sure that Hailey must be having a joke at her expense.

"You can't be serious?" She squeaks, feeling her pussy clench just at the sight of it, "that thing looks like it'll break me in half!"

"Pshh," the petite redhead snorts dismissively, "you're a big girl, I'm sure you can handle a lot more than this."

Hailey untangles a bundle of leather straps that somehow becomes a harness for the rubber phallus, with the added bonus of making her ass look amazing when she pulls it on.

"There's nothing to it!" She giggles, the free end of the dildo wagging obscenely from her crotch as she clambers back on to the bed. "You just lay back and be a good girl while I fuck your adorable brains out."

Gently but firmly, she pushes Carla's legs apart and guides the head of the fake cock past her dripping lower lips.

The feeling of being penetrated, of being filled and stretched apart to her absolute limit, was indescribable, strange for Carla. She'd never in her wildest fantasies imagined anything like this. Of course as a boy all of her fantasies had involved doing the fucking, not being fucked. Yet, it felt like the most natural thing in the world as her hips rose to meet her lover. Her gasp of surprised delight turned into a moan of incoherent lust as Hailey bottomed out in her.

Slowly at first but with rapidly mounting speed and rough enthusiasm, Hailey rode her, ploughing deep and hard into Carla's tender depths.

"Oh fuck yes that's good!" Hailey panted, "That's my good pet, my good slut."

Carla blushed, loving the praise as much as the pounding of Hailey's cock.

"Oh, oh, baby!" she gasped, "I'm going, gonna AHH!"

Carla came, her pussy clenching around the pumping dildo. Hailey came with her, their joined cries echoing through the thin walls of the dorms. Thumps and catcalls echo back from the other residents, some protesting, others encouraging.

The pair collapsed in each other's arms, giggling like embarrassed school girls.

"Oh wow," Hailey chuckled, "You know, I wasn't lying when I said I never do this, but I'm glad we did..."

"Yeah, that was..." Carla struggled to articulate the complex emotions she was feeling, "different. Good. Definitely, really good, and, um, different..."

"Oh dear, I think I broke you," Hailey laughs as Carla trails off. "Damn, I'm good. I'd love to go again babe, but you've clearly had enough for now. Why don't you run along, and I'll see you later, okay?"

Still a little wobbly from his sexual workout, Carla hurriedly dresses and heads back to her room, not at all certain what she is going to do next.