While doing solo masturbation, I was caught by my sister who pitied me and offered to help me lose my virginity. I got to touch her stunning J-cup, bowl-shaped perfect breasts for the first time, but strangely felt no response and grew frustrated. However, once I skillfully removed the condom and penetrated her bareback, her incredibly sensitive body was revealed. My sister, who had always looked down on me, completely transformed—crying out in intense pleasure and receiving creampie after creampie.