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I suddenly hear some weird noises and go check my step-son's room. The closer I get to his room I hear a girl moaning loud. He was supposed to focus on his lecture. i didn't even know that he has guests... I am so shocked and angry but hearing them fucking it makes me horny and I start masturbating behind the door. I am so pissed to hear that yet can't stop touching myself. I can't believe he is fucking her so good, they're only 18, i envy her. His girlfriend moans louder and talks dirty to my step-son and she reaches orgasms and so do I . After orgasm I decide to enter into their room and confront them. "How dare you?" I say. "you're not supposed to do that, go home" I said to his girlfriend. After she left, I confront him once again. I thought I am the only woman in this house, you can't fuck any girl under my roof. She is so young and has no sexual experience. Her boobs are so small. Step-mommy is so much better. Here, let me show you my boobs. I bet you love them. Now let me stroke that cock. You're getting so hard for step-mommy. Let me shove that hard cock inside me. That feels so good, even better than your step-dad. Keep fucking me harder and faster and make step-mommy cum for you. This is how you're suppose to feel and no one can fuck you better than step-mommy.