My father-in-law invited me to go on a hot spring trip with my family of four. On the surface, it was a fun family trip, but my true purpose was to have a baby-making trip, which was under pressure from my father-in-law. Despite this, I have been abstinence to try to get pregnant, and my wife has become so boring that I can't help but have a baby. I no longer know how to suppress my accumulated desires, so I wandered around the inn in agony and happened to see my stepmother taking a bath...