Mitsuki comes to visit her husband's parents' house. Seeing through her father-in-law's perverted Kokoro, she teases him with a flash of her miniskirt. The mother-complex husband goes shopping with his mother-in-law, leaving his father-in-law at home alone. The father-in-law gets excited as he peeks at Mitsuki's plump body as she starts cleaning the bath. The father-in-law helps with the cleaning, but his erect penis presses against Mitsuki's ass crack and they can't hide their excitement. The perverted daughter-in-law presses her big breasts against his back as she washes his father-in-law's, but she can't help but notice his erect penis. The perverted father-in-law pretends to wash his daughter-in-law's big breasts and squeezes them. Unable to hold back, the two embrace each other passionately, kissing each other and the daughter-in-law taking her father-in-law's erect penis into her mouth and sucking it. Even after the husband and mother-in-law return home, the father-in-law and daughter-in-law embrace each other in the room next to them, touching each other's bodies. As soon as the husband and mother-in-law go out again, the two start having forbidden sex. A lewd daughter-in-law who exposes her indecent behavior in front of her father-in-law.