A rebellious, haughty younger sister is brought to orgasm by her hated older brother's enormous penis during the three days their parents are away. Kasumi Riko SSIS-471

Riko is a female student, and her stepbrother is a nerdy NEET... Due to their parents' remarriage, they are suddenly forced to live under the same roof. Riko isn't interested in her unassuming brother who suddenly moves in with her. During the three days her parents are away on vacation, Riko secretly uses a vibrator to masturbate in her room, but is filmed and forced to have sex with them. However, the two have one unexpected thing in common... Riko and her stepbrother have amazing sexual compatibility. The rebellious, arrogant younger sister is repeatedly brought to orgasm by her most hated stepbrother.