Chika is married to her husband and lives with her father-in-law. - Although the sex with her husband was light, Chika was satisfied, but as each month and year passed, the number of days and frequency of sex decreased. - After all, Chika's sexual desire was so strong that her husband's physical strength reached its limit and he started making noises. - Chika had no choice but to cheat by masturbating during her alone time. - The father-in-law was enjoying their married life, observing Chika and keeping a diary. - At some point, Chika's clothes changed. - High exposure and no bra? - No panties? - He was dressed in such a way that it was easy to mistake him for it. - At first I thought it was part of her activities with her son, but when she looked back at her diary, she realized that she had been acting like that ever since her activities with her son had decreased and stopped. - One day, my husband went to work and my father-in-law went out on some errands, and when I was enjoying some solo masturbation time, my father-in-law had come back after being absent from his errands. - The father-in-law stares at Chika, who is crazy about masturbation, with a surprised expression, but he gets excited by the sight of Chika's painful moans and puts her in a handbasket. - Her father-in-law's seasoned caress is amazing, and she is made to cum over and over again by his cunnilingus, which is especially naughty. - The father-in-law's dick was bigger and harder than her husband's, and Chika reached climax the moment he was penetrated. - A few days later, her family left and Chika, alone, unsteadily took out her father-in-law's underwear from the laundry basket and sniffed it. - When Chika runs her fingers along her crotch, remembering what she did with her father-in-law, Chika's underwear becomes obscenely damp...