Julia and Kenichi have been married for six months. Recently, her father-in-law's house was severely damaged, so he had to stay at the couple's house for a while. Her father-in-law is a very kind person but always distant with her and her husband, which makes her feel very uncomfortable. Her life is very happy, except that her husband always neglects their sexual relationship. The pressure of work makes Kenichi always wake up early, constantly travel for work, so he is always tired and not interested in sex. Once he read an advertisement for a type of aphrodisiac drug that can increase sexual desire in any situation. Kenichi decided to try it and planned to use it after his upcoming business trip to make up for the neglect towards his wife. He mixed the drug into tea and put it in the fridge. The next day, Kenichi went on his business trip, Julia saw a bottle of tea in the fridge, thinking it was a gift for Kenichi, so she invited her father-in-law to try it. Under the influence of the aphrodisiac drug, their rationality faded away and was replaced by sexual desire. They both rushed into each other, the house filled with sounds of lust. This was the most pleasurable sexual experience for Julia. Even though the effects of the drug had worn off, she could not forget the pleasure of her father-in-law thrusting his huge, hard cock inside her. Therefore, whenever her husband was not around, she secretly sought out her father-in-law and asked him to soothe the growing demon of desire inside her...