https://www.dlsite.com/maniax/work/=/product_id/RJ01401017.html

Due to his parents’ sudden trip abroad, the protagonist has to live alone with his rebellious younger sister for a month. One night, he peeks into his sister’s room and finds her struggling to masturbate for the first time. As a brother, he decides to develop his sister’s body in the middle of the night in order to release her sexual desire. The naughty 30 days with his sister begins!

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