The mother-in-law helps her son-in-law satisfy himself while his wife is pregnant.

My mother-in-law, Marina, will be going to Tokyo to support my wife, who is due to give birth. So the family relationship is fine... I thought, but I've banned masturbation for the time being because I'm 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 remorseful and asked if I could help. I made a suggestion that I didn't even want to...