I was on a hot spring trip together to celebrate the silver wedding anniversary of my wife and my wife's parents. My father-in-law ordered me to plan to have a baby with my wife, so I was on my trip with my sperm up to my limit. However, at night, my wife and father-in-law get drunk and fall asleep quickly, and the situation ends up being alone with my mother-in-law. I was captivated by the flushed cheeks and white skin peeking out from my yukata, but I lost my rationality due to alcohol and a lingering sexual desire, and I couldn't hold it in and attacked my stepmother...