Stand up to her.

"I can tell you're already wearing yours. You've certainly got something up your ass," you respond.

Rachel stares at you in astonishment and advances on you menacingly until she's right in your face. Your vulnerability at being completely naked in front of her strikes you suddenly. "Why, you little slut!" she spits out in a fury. "Who do you think you are!? You fuck my boyfriend and then you dare talk to me like that!?"

You try to keep the quaver out of your voice as you say, "I didn't fuck your boyfriend. Your boyfriend fucked me. Don't blame me if you can't hold his interest."

Rachel's face goes red and she's nearly quivering in rage. "You bitch! I ought to...." She holds up her hand as if to slap you, but you keep your nerves steady and just stare into her eyes, never breaking your gaze and she backs down. "You haven't heard the last of this, Parker," she says and stalks off in a fury.

You stand still for a moment, trying to keep from shaking. Julia, who had been sitting quietly next to you the whole time, gives a low whistle. "Wow, I don't think I've ever seen anybody stand up to Rachel like that before. God, that was so hot."

You put on the sports bra and panties and Julia gets dressed so she can help you with the rest of the uniform.