18 year old stepson is mine! Nothing with girlfriend!

I thought now that I've fucked the Stepson and he had his first time having sex, he is now brave. I found out that he now has a girlfriend. He didn't make the calculation with his jealous stepmother. In any case, he came innocently into the living room and then I told him my opinion that there wasn't any girlfriend for him, he was only mine. I showed him that straight away and fucked him nicely and he doesn't want to tell his little girlfriend that he's doing it with me. hahaha