I invited my parents-in-law to a hot spring trip so that my father-in-law could recover from his leg injury, but he wanted to have a grandchild, so he seemed to see the trip as a trip for my wife and I to have a baby, rather than a trip for recovery, and he felt a little pressured. I abstained from sex for a month as my father-in-law told me to, but unfortunately, my wife started her period... At that time, I was left alone with my mother-in-law, and I couldn't control my reason at the sight of her flushed cheeks and white skin peeking out from under her yukata, so I attacked her...