My mother takes advantage of my boyfriend and I catch them


My boyfriend and I had always fulfilled many fantasies. One day, we decided to make the hottest one which was to use BDSM tactics. So, I tie him to the bed and when I have him very excited and I’m going to sit on him to fuck him, someone knocks on the door. I go out to see who he is and meet my mother. She asks me to do her an urgent favor and I leave her at home because I forget what I was doing. But, when I get there, I find my mother screwing my boyfriend intensely. Everything was recorded with the cameras he and I had set up to remember the moment. What do you think about it?