My younger sister Nao, who was living an otaku life in the countryside, came to Tokyo from her hometown at the same time as graduating from university. She has no job or room, so she stays at her older sister's house until they find her. However, her sister Nao is shocked by her sister's night life. She peeks at her big sister as she squirts like she's about to break, moans like screaming, and cums over and over again as she cums over and over, and she wets her crotch. And she can't stop her overflowing desires and she takes bold action...
