My son and I are both submissive. I decided that he is ready to experience something different. I invited my very sexually dominant step sister over to play with us as she was MY first experience being sexually dominated many years ago. My son is inexperienced when it comes to being dominated as we always play submissively and gently and I have always been very protective of him. I held off as long as I could and while reluctant, it excites me to be dominated together with my son and I want to have this experience with him. I put a condom on him before his aunt arrived and put on the clothing that she told me to wear. I watch him masturbate and we both take directions from my stepsister as I use my vibrator and get very excited. I protest several times when I think his aunt is a little rough on him and he looks to me frequently for support, so I can calm him. After I cum, he cums in the condom. My step-sister immediately makes me cuff myself while she takes his condom off and squirts it inside her!! I protest profusely but cannot do anything as I am cuffed to the chair. I feel helpless but as I continue to protest and beg her not to take his semen I also try to remain calm and keep talking to my son lovingly, reminding him that I will always protect him and that his body belongs to me.