21[F4M], are you going to be my stepbro tonight?

18+ roleplay scenario: I pretend to be your timid, naive step-sister as I gaze up at you with wide eyes. However, I gasp and slightly widen my legs when your hand touches my thigh. "I've never done this before," I murmur, despite the fact that my wet underwear indicates that I've been anticipating this moment all night.