[MFYD-167] After being caught peeping on my big-butt, obscure older sister with an abnormal sex drive, I was forced to straddle her drenched in sweat and repeatedly ravaged and seduced by a beastly stake press during my summer homecoming.

After several years of returning to Obon from his university life in Tokyo, Kanata returned to his family home for the first time in three years, feeling comfortable with the unchanged scenery of his hometown. However, when he returned home, he met Claire, his older sister in her late twenties, who wore a Class T-shirt from ● School and lived in a garbage room. While Kanata was in Tokyo, she divorced and became a loser who spent her days watching BL and idling around. One day, when I peek into my sister's room, I catch her sweating, exposing her incredibly huge butt and masturbating. I can't take my eyes off my sister's perverted masturbation, but she finds me and forcibly dragged me into the room...