Stepmother wants to fill the pussy with the dick of stepson

I have always had this kind of dirty thoughts on my stepson. But since I am her stepmother, I never tried to make any of these fantasies. However, the day in which you would be transferred to the college I felt a deep desire not to let it go, not until I could realize my fantasy. So I confessed to him that I wanted his cock inside me. He was surprised and disappointed. He wanted to have more time to fuck. But we had only a couple of minutes of which we enjoyed to the full. I touched her tits and I made him a blowjob. His cock was bigger than I had imagined. And when he put all his cock in my pussy, I felt my vagina close and hungry for sex.