Kana lived with her sister Nami and Nami's husband Keita. Originally, it was just Kana and Nami living together, but after they got married, Keita moved in. Kana wasn't angry; she was actually happy to have a cute younger brother. One day, Kana was late getting home from work and dozed off on the last train. She felt a gaze from the opposite seat and slightly opened her eyes to see Keita intently staring at her lower body and stroking his cock. Shocked, Kana felt a perverted excitement and started teasing him by lifting her skirt to show her panties.
