I was seduced and tested by my girlfriend's cunning and erotic big-breasted sister with her braless act, and then I was corrupted by the little devil's breast play. (Chiba Yuka MIDA-488)

My girlfriend has absolutely no interest in sex. I was thinking I could spend the weekend at her place and have some fun... Now it looks like we'll probably just watch a movie or play games... Just then, my busty sister, the complete opposite of her, came back. My gaze was involuntarily drawn to Yuuka, who was bending over and blowing air into her bra cups with a fan. As a result, Yuuka took photos as evidence of me peeking at her breasts, and from then on, I became obsessed with engaging in erotic acts with my sister who betrayed her...