Catching your step-mom with a man in bed... a man in bed who is NOT who you know it should be... Well, she seems more annoyed at you than anything. After she kicks the guy out, she asks you straightforward: "what do you want, you little POS?"

This is your time to shine. You want what she was giving to that guy. She's chuckling, no way about it is she interested... but she also needs this relationship to work out. So she agrees - and assumes it's just you trying to lose your virginity easily. And acts uninterested at first... but once your cock comes out and she takes a look, she's shocked how much bigger it is. WOW. And when you get it in there, WOW.

You can't just give this cheating slut your good dicking though, not without some kind of embarrassment on her part. So you stop and make her beg a little. Then have her say some things. Call herself a whore. Then whore STEP-MOM. And the more she refers to herself in that title... the close you are to busting.