Boys Will Be Boys

High school boys, best friends since forever. Hang out over the weekend. Older sister home from college. Patrick has a crush on her. Friend says you have no chance, she thinks you look like a girl. Later, they are watching porn, and getting horny, and Patrick goes to the bathroom to pee. Sees a bra and panties of hers lying there. Just for fun he picks them up and puts them on, and finds he looks hot in the mirror.
He decides to show his friend. His friend meanwhile has stripped and has oiled his pecker, and is stroking the full monty. Incredulous when Patrick shows him, makes him sit on his lap, then without panties, and lubes up the asshole, and the rest is his story.