Please, dont cum inside step-mom while step-father at the shower

I came home from work a little early and wanted to warm myself up a little while waiting for my husband. I started masturbating and at some point I felt him start licking me. It was so nice. I was already approaching orgasm, I wanted to see his eyes and it turned out to be my step-son and not my husband! He fucked me so well that I wanted more, but I asked for only one thing - not to cum inside me