Your ass

"I was just going to fuck your ass if you were a guy," Olivia said, "and your ass is so much nicer now."

You feel Olivia's hands spread your ass cheeks, and her cock push against your anus. Your groaned as it pushed in, inch by inch, until her hips were against your ass. Then, she pulled back to just her tip, only to slam forward all the way. You moaned from the pain and pleasure as she fucked you. You kept your eyes on Stacy, who was now fingering her asshole in time with Olivia's thrusts. Her other hand played with her breasts, and drool rolled down her chin. Your girlfriend was watching you, now a girl, get fucked in the ass by your roommate, and she couldn't get enough.

Olivia spanked you again, and pulled you back by your hair until your back pressed against your breasts, continuing to fuck you. Your new position made it so your breasts heaved with every thrust. Her other hand reached around, and she shoved three fingers in your brand new pussy. Stacy started to play with both of her holes, and you felt a heat building in your core, spreading throughout your body. Were you close to an orgasm?

"You're so tight," Olivia moaned, "I think I'm gonna cum already."