They aggressively scissor her

Before Rachel could process what was going on, the two roommates pulled their pants down and rushed towards her with their bare pussies hanging out.

"You want a lesbo session? You're getting a lesbo session!" Carla shouted, slamming her coochie into Rachel's.

"Yeah, how dare you make us faggots!" Veronica joined in the slamming as the duo asserted their heterosexuality by partaking in this scissoring...

if by that you mean three pairs of scissors, all closed, and two of them bumping into the third quite clumsily. Between these pelvic thrusts that she was receiving when everyone was standing up, Rachel felt very little stimulation and was more amused by this spectacle.

"Sounds like you two have some issues..." Rachel just turned away. "I'm going to go now."