After getting married, I was invited by my wife's parents, with whom I had been estranged, to go on a hot spring trip. On the surface, it was just a family getaway, but in reality, it was a baby-making trip, and my father-in-law had ordered me to abstain from sex for a month before the trip. I was at my limit, and just passing by my mother-in-law after she had gotten out of the bath made me get an erection. However, my wife was so engrossed in the hot spring that she wouldn't let me hold her at all. I ended up spending a tormented night, and as I was walking around the building trying to calm my sexual desire, I happened to see my mother-in-law taking a bath...