I come home and find my stepson waiting for me. He wants to discuss something..he shows me a video on his phone of me cheating on his father. I'm shocked and demand he gives me the video. He has other ideas, however. He blackmails me into watching him masturbate in exchange for keeping quiet about my affair. I am completely disgusted at first, but admit he does have a nice cock, even though he's my stepson. I know it's wrong, but I end up joining in and we masturbate together and end with a cum countdown and mutual orgasm.