Yuzuru moved out to live on his own after passing the university entrance exam. His neighbor is Sumire, a beautiful and kind woman who always cares and helps him. Today, Sumire bought a cake for her husband, but he suddenly had to go on a business trip. On the way home, she met Yuzuru and invited him to her house to eat cake and drink coffee. The coffee was a bit bitter, so Yuzuru wanted to add some sugar. Sumire couldn't find it, so she tried to search in the lower cabinet and had to bend down low. Because of that, her large and alluring buttocks were directly in front of Yuzuru. He was attracted to her buttocks, his penis quickly became erect, and his mind gradually lost control. He grabbed Sumire and inserted his penis inside her, giving her a "cream pie." Sumire was not very angry with Yuzuru, but she made him promise not to disclose this incident and not to repeat it. Yuzuru promised, but a few days later, Sumire called him to her house to fix the air conditioner. And Yuzuru played the role of a "lucky air conditioner repairman" while admiring her beautiful buttocks from below. Unable to control himself, Yuzuru continued to overpower Sumire and have sex with her. And their twisted relationship began from then on, with Sumire actively going to Yuzuru's house to guide him in practicing yoga, but her real intention was...