Raw unprotected sex on the couch after crazy night out

My buddy and his colleagues go out for dinner and karaoke partying and he asks me to come along. i successfully entice one of his coworkers during that night out following her out to the bathroom when no one else notices rubbing with her phat boobs, taking her number and swapping all sorts of nudes at the ktv. at the end of the night she pretends to go back home but instead takes down my address and heads my apartment building.