Stepson gives stepmom ultimatum

This morning when cleaning my stepson's room I found several magazines under a pillow. I was shocked by what I saw. These were some pretty hardcore gangbang sex photos. But as I flipped through the pages I found myself becoming aroused. Instead of confronting my stepson later when he got home, I hid the magazines in my own bedroom. At bedtime I pulled one of the magazines out, stripped down, and climbed into bed. As I looked through the pictures I began to touch myself. I was so engrossed in the magazine and the pleasure I was giving myself I didn't notice my stepson sneak into my room. Hearing a noise I look up startled to see him standing there. I demand he leave. He ignores me. He holds up his phone showing me pictures he has just taken of me in bed looking at a porno mag. He threatens to put them on the internet. Unless....I pull back the covers and masturbate in front of him.