Rio was under pressure to give birth to a grandchild. One day, at the suggestion of his father-in-law, he decided to go on a hot spring trip with his family. However, his mother-in-law ordered him to abstain from sex for a month before the trip to give birth. On the day of the trip, Rio was rejected by her husband for sex. On the other hand, his father-in-law also tried to persuade his wife but he refused. The two of them were so sexually excited that they went to the hot spring to soothe their bodies. And the father-in-law happened to witness Rio bathing.