You caught me in a...compromising position with a coworker of mine earlier. The thing is, I just have a much high sex drive than your step-father, and it was only physical, it doesn't mean anything. Your step-father won't understand though, he'll leave me and us if he finds out I cheated. I make you promise not to tell him what you saw, but you want a little something in return. I strip and let you jerk off for me, your step-mom, as long as you promise to keep quiet.