Xxx sex with my girlfriend's sister

My girlfriend's sister drives me crazy, and when I go to her house, she always looks at me lustfully, like she wants to eat me whole. when I find out she's going to be alone for an afternoon, I make a fool of myself and stick around, as if she wants to see what happens. being alone in the house, she doesn't hesitate to let me in, and we both end up in her room, with her masturbating, touching her huge boobs, wanting him to fuck her once and for all. he throws himself on all fours on a couch, showing me his ass, that ass that drives me so crazy, and that I'm finally going to be able to fuck.