My son-in-law caught me masturbating, and this is what happened

I was pleasuring myself in my room, thinking no one was going to come in. My fingers were deep inside me, and I was just about to come when the door opened. It was my son-in-law. He stood there staring at me, with that I just caught you look on his face, so I covered myself. I stared right at him and told him to come in. I said that if he left, my stepdaughter would find out that he’d caught me. He closed the door. He came closer. He put his embarrassment aside and fucked me right there, on the unmade bed, covering my mouth so no one would hear. He came inside me and walked out as if nothing had happened.