The first humiliation. [34M] (cuckold)

I have previously shared about the story of my life. I am a Bull who was introduced to a unique couple — the husband is paralysed below his waist. I became their regular Bull and eventually I fell in love with the wife and now, we are in a poly kind of lifestyle.

So, this is the story of the first sex we had where we somewhat dipped our toes into the humiliation kink. Right now, everyone is our family, that includes my family, her family and his; everyone knows about our lifestyle.

But when no one was aware of it, the husband's mother once invited them for Christmas lunch and she invited me too because I have been their neighbour for quite some time now and his mother is well acquainted with me and was quite fond of me since she has seen me help her son around a lot. She has even seen me drive her son to his therapist.

We went there for lunch. We reached early. While we were there, his mother was still cooking. His mother is a widow and lives alone with her cats. So, the husband suggested that we go check his childhood room. It was on the first floor and her house did not have the requisite contraptions to push his wheelchair up there. So, I decided to carry him.

We reached his room and looked around. We talked for a bit and all of a sudden, we bot frisky and his wife and I felt like having some fun. Now, because his mother was unaware of the situation and it would be quite risky to fuck her daughter in law at her son's childhood room, we decided to do something. I opened the door of his room just enough, I made him crawl on the floor and sit just beside the semi open door and keep the door. I told him be alert and watch if anyone is approaching while I fucked his wife right there on the bed he grew up.

Fortunately, no one came but his mother did once shouted at us from her kitchen because she thought we were being a nuisance and creating stupid noises like some petulant children.