After 30 years of marriage, my wife, Saki Okuda, begins to itch every night while embracing her mother's ape-like father's magnificent penis. (SONE-664)

Because her husband changed jobs, Saki lived with her adoptive parents. Even though she was older, she was happy to see the good relationship between her adoptive parents, but soon she faced a shocking situation. Her adoptive father was a man with a terrible sex drive who would passionately embrace her adoptive mother every night. Every night, she could hear disgusting moans and lewd sounds, making Saki feel itchy in her groin. So she would peep at her adoptive parents' lovemaking and then have sex with them herself. "I also want to be held like that by a beast..." and then she decided to seek her adoptive father's embrace herself... "Wanting her adoptive father's amazing cock," the lustful son and wife could not bear it any longer and launched a counterattack at night. Because of her fading feelings for her husband... Saki was addicted to the intense sex with her adoptive father.