Continue to jerk off.

You confine to jerk off in Sally's bed. Pretending not to notice her. You close your eyes and moan her name. "Oh fuck sally! Stroke my cock faster!" You peek at her watching you. She stares at your cock with wanting eyes. You want to grt her to act first. "Oh yes sally! I wish i could be deep inside you!" Sally seems to be getting horny. Her face is blushing and and her towl is starting to slide off. "I want to fuck my cousins pussy! I want to fill her pussy with cum!" She lets out a light gasp. You peek once more and find that her hands are under her towel. Shes definitely masturbating.