I went on a trip to a hot spring with my wife and her parents to celebrate their silver wedding anniversary. My father-in-law had ordered me to plan a baby with my wife, so I had saved up as much sperm as possible before the trip. However, at night, my wife and father-in-law got drunk and fell asleep early, leaving me alone with my mother-in-law. I was captivated by my mother-in-law's flushed cheeks and her white skin peeking out from under her yukata, and I lost my reason due to the alcohol and my pent-up sexual desire, and I couldn't hold back and attacked her...