You push open the door without knocking, and there she is — your roommate stretched across the bed, that perfect ass angled toward you like she knew you were coming.

She glances back over her shoulder, not startled, not covering up. Just watching your face, reading exactly what's happening behind your eyes while you stand frozen in the doorway.

Your hand is still on the door handle. You could back out. You could pretend you saw nothing. Instead your fingers tighten, and she shifts her hips just slightly — a deliberate, unhurried invitation.