Reika married a man with a stepchild. She has a good relationship with her husband, but her son-in-law, Yuki, is introverted and her relationship with him is not going well. Then, at her husband's suggestion, she decides to go on a trip to a hot spring, and the two finally begin to open up to each other... Yuki, who secretly had feelings for her as a member of the opposite sex, can't hold back and attacks her in her sleep. Reika writhes in agony as the caress is left to her youth and vigor. Her body unconsciously aches for his cock as she has sex with her husband that is so compatible that she has never felt before.