One year after her father's death, Iroha's mother visited her daughter and son-in-law's home. It had been a long time since they last saw each other, and seeing her mother in good health brought him relief. That night, he accidentally caught sight of his mother-in-law naked in the changing room. How much time had passed since then? Seeing her again after so long, he couldn't help but become aroused. He asked his wife for sex, but she turned him down. Yet his erection remained firm, refusing to subside. In the end, he sneaked quietly into his mother-in-law's bedroom, gently pulled back the covers, and the moment his hands touched her skin, he couldn't hold back and came right then and there. Amid the complicated emotions of reuniting with his mother-in-law, a new desire began to stir within him.