Concept: Don't Tell Mom

My wife is pissed because she caught our stepson trying to have sex with his girlfriend under our roof and expected me to deal with them. Oh, I was going to talk to them, alright. I was also very mad, fuming, and disappointed, but not because they wanted to fuck. I was frustrated because my stepson had no idea how to do it! As his stepdad, I can't let him embarrass himself like that, so I made a deal with both of them: I would let them have sex and even teach them how to fuck, with only one condition: don't tell Mom.