Mio was adding a little excitement to her marriage through phone sex with her husband while he was on a business trip. One day, during an intimate call with her husband in the middle of the day, her son Haruo suddenly entered the room, slid between her legs, and began licking her wet pussy. Excited and aware that her son had noticed her arousal, Mio became even more aroused by Haruo's skilled tongue, igniting an uncontrollable desire within her.