Fucks her from behind

Jimmy pulls his cock from his pants and kneels down behind your friend and places the swollen head between her legs. Despite the size of Jimmy's cock, with very little effort you see it slip into to Katy's soaking pussy. As he begins to thrust his cock into her he places his right thumb into her asshole. Katy has never allowed you to play with her anus and the fact that isn't resisting is making your cock quite hard.

Katy is now making no attempt to be shy. She is thrusting her ass back at him with each of his thrusts and her moaning is becoming louder as Jimmy's thumb loosens her asshole.

I can guess what is coming next, and it doesn't take Jimmy must longer to pull his thumb out of Katy's anus and slide his cock in.