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Ane no Seiyoku Shori wa Otouto ga Suru Mono da to, Gitei wa Omoi Hajimeteiru.
姉の性欲処理は弟がするものだと、義弟は思いはじめている。
A big sister always takes care of her stepbrother's sexual relief. Lately, she has started to enjoy being handled more roughly. Her request is to be fucked harder than usual. He grabs her by her ponytail, her charm point, and does his best to be a bit rougher with her breasts and more forceful during blowjobs.
The little brother has begun to think that taking care of his stepsister's sexual urges is his responsibility. As their encounters grow more intense, he takes the lead, pushing her limits while she surrenders to his dominance. Their relationship shifts from a casual arrangement to something deeper, where both find satisfaction in their new dynamic.
