My wife and mother-in-law are big fans of the hot spring idol "Soukai Onpu", and I found out that they were going to a nearby hot spring next month, so we decided to go on a hot spring trip as a family of four. However, my father-in-law asked me to take advantage of the hot spring atmosphere to try to conceive, and ordered me to abstain from sex for one month until the trip. On the day of the trip, my wife, who was crazy about the idol and the hot spring, paid me no attention at all. I ended up spending a tormented night, and while I was wandering around the inn, I happened to see my mother-in-law taking a bath...