"That's embarrassing... please stop..." Her father-in-law says that it's his dream to wash her back when they're alone together. Serina is confused by this father-in-law, but can't bring herself to strongly refuse. It's the first time that her father-in-law, who is always a gentleman and kind, has done something so unexpected. While she is worried about causing trouble, she is gradually cornered in the bathroom. When her father-in-law, with his usual smile, rubs her voluptuous breasts, Serina realizes that a crack has appeared in her peaceful married life...