Shinji lived with his wife and mother-in-law, but since his wife frequently went on business trips, he effectively lived alone with his mother-in-law. She appeared cute and delicate like a small animal, and to Shinji, she was like family. However, one day, she accidentally applied an aphrodisiac cream, causing her sexual desire to spike uncontrollably and focus entirely on Shinji. Unable to resist, she became fixated on his erect penis, overwhelmed by insatiable lust. Shinji, already attracted to her charm, gave in, and they engaged repeatedly in various positions—doggy style, cowgirl, missionary—indulging in creampie after creampie. Alone in the house, son and mother-in-law dive into a forbidden, passionate affair.