The Oshima family lives with their daughter and son-in-law. The son-in-law, Kazuya, changes jobs to become a cleaner, but only his daily routine is out of sync... Such Kazuya is supported by his mother-in-law, Yuka, with a warm, enveloping kindness. Despite knowing she is his wife's mother, Kazuya finds himself increasingly drawn to her. One day, they both realize that neither has been having sex, and Kazuya can't hold back any longer, pushing Yuka down. Even though he knows she is his mother-in-law, her body, hungry for pleasure, regains its moisture, swallowing his cock deep into her vagina...
