She is a pervert and takes advantage of her stepson

I come to visit my girlfriend and I feel very calm and well-behaved on the couch. There I wait for her to tell me where this girl is and the least she does is that. She starts talking about how things were before when she was single and how she had to marry her husband. Now she is alone and at that moment I realize that no one can resist my mother-in-law’s big tits. Because I myself can’t resist. I noticed it when she starts giving me a cock suck and I have to fuck her pussy afterwards. At that point, I understood everything he wanted to tell me at the beginning.