Mother-in-law helps son-in-law satisfy his wife while she is pregnant

My mother-in-law, Marina, will be coming to Tokyo to support my wife, who is approaching her due date. So the family relationship is fine… I think, but I have given a masturbation ban for the time being because I am not allowed to enjoy happiness alone. A few days later, I was hiding in the bathroom masturbating when suddenly Marina opened the door. I was shaken by the sudden change, but Marina-san, aware of the situation, seemed apologetic and asked if I could help. I made a proposal that I didn't even want…