You are my step-son's friend and have come to celebrate my step-son's birthday party. There are quite alot of people here. As I greet you and we chat for a bit I start to notice you are watching me quite alot. I ask you for a favor, and tell you to follow me. We end up in the bathroom and I make sure to lock the door so we aren't disturbed. I have to admit that I am really turned on and really want you even if it's wrong. I start to tease you knowing you won't be able to resist me. Pulling out my big tits and telling you not to worry about who's out there just to forget about your girlfriend and the fact that I'm your friends step-mom. All that's important is that we have a good time at this party. I encourage you to get your cock out for me and start to suck you deeply, but that isn't enough and I ask you to take you wildly on the sink. Sitting with my legs spread apart playing with myself I tell you to slide inside me. As we are fucking, your girlfriend who is at the party notices your absence and she's come looking for you... She knocks on the bathroom door.. I put my finger to my mouth and tell you to be quite until she goes away, we can't let her find out about our dirty secret now can we and how you've been cheating with your friends step-mom!