Invited by my father-in-law, the four of us came on a hot spring trip. On the surface, it was a fun family trip, but the real reason was to have a baby, which my father-in-law was pressuring us to do. Despite that... I had been abstaining from sex in order to try to get pregnant, so I ended up upsetting my wife over something trivial, and I was no longer in the mood to have a baby. Not knowing how to suppress my pent-up desires, I was wandering around the inn in frustration when I happened to see my mother-in-law taking a bath...