Stepmother, can you see my huge erection?

This weekend I went home to visit my father, but he was traveling. I had to spend the weekend alone with my stepmother. On Saturday I went to drink with my friends, and the day after I had a terrible headache. I took some pills for the pain, but I think I took accidentally the pills wrong. I still had the headache and I also had a huge erection. I explained my problem to my stepmother, and she gave me a very strange but exciting. Told me I could jerk off with his legs. I would not have ever fucked. I just had to put my cock between her legs very near to her pussy. And so we did, she masturbated this way, and I am able to ejaculate on his ass.