START-098 A story about how I succumbed to the unconscious temptation of my girlfriend's big-breasted younger sister who was deeply interested in sex and was forced into NTR Nanase Aoi

Nanase, who moved to Tokyo from her hometown of Okayama to attend university, ran into housing troubles and ended up taking care of her sister in an apartment where she lived with her boyfriend. Nanase, who has been away from his girlfriend's parents and is curious about many things, ends up taking an interest in her sister's boyfriend, Yuta... Cute, big breasts, no bra! A dream-like story about being cuckolded by your girlfriend's younger sister who is getting more and more erotic!

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