The son-in-law, who had always been worried about his mother-in-law Azusa, who lived far away, planned a hot spring trip to spend some time with her. Both his wife and mother-in-law were delighted about the long-awaited family trip, and the son-in-law smiled as he gazed at his mother-in-law's attractive body. Upon arriving at the inn, his mother-in-law headed to the bath. His wife received an urgent work call, so the son-in-law secretly peeked at his mother-in-law changing. Excited by his mother-in-law's body, which was more erotic than he had imagined, the son-in-law devised another plan. At dinner, with the feast laid out before them, he offered his wife some alcohol. That is, to get his wife drunk. The plan worked, and he crept closer to his mother-in-law, covered her mouth when she protested, and continued to caress her. As Azusa's crotch became increasingly wet, the son-in-law poured out his desires. Azusa, too, was overwhelmed by waves of pleasure from this long-awaited act. When her son-in-law released his semen into the hot pot, Azusa also reached her climax.