To support my wife who was feeling unstable during her pregnancy, my mother-in-law, Miki, came to live with us from her own home. With her support, I felt more relaxed, but I ended up upsetting my wife over some minor issue, and she forbade me from masturbating. A week later, Miki came to give me a massage, saying she was tired from watching over our relationship. Unaware of my state of arousal, every time she touched my body, my crotch would become more erect. Miki noticed this and, blushing, made a lewd proposal...