If your friend's sister's panties are in the bathroom... your friend's sister is quite into you, and your dick reacts to it, so you start masturbating, only to be found by her! You'd think she'd get angry, but it turns out to be a lucky development! She gets turned on by the stiff cock, playing with his crotch and giving him a slow, aggressive blowjob! Unable to resist, she inserts herself in the cowgirl position while still fully clothed, saying, "You tried to cum with my panties... you're so cute, I want to eat you up."