Powerful mature woman demonstrating her skills

My stepmother and I have a very good relationship, we are always joking and in general there is a very good vibe between the two of us. We often make sexual jokes, but at first I took it as a simple game and never thought that she really wanted to go much further. The other day I was lying in my bed and she came in with a slightly strange look. I thought it was strange that she was wearing a robe and underwear underneath, so that I could clearly see her tits sticking out of her bra. Out of inertia I took out my cock and started masturbating while she slowly approached. There was no doubt that slut wanted to suck me.