Related Doujins, similar to Otouto no Seiyoku Shori wa, Ane ga Suru Mono da to Onee-chan wa Omotte iru. | 弟弟的性慾處理是姊姊的義務，我的繼姊覺得這樣理所當然。 from Original Work

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Otouto no Seiyoku Shori wa, Ane ga Suru Mono da to Onee-chan wa Omotte iru.

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Otouto no Seiyoku Shori wa, Ane ga Suru Mono da to Onee-chan wa Omotte iru. | Sister Was Thinking About Her Younger Brother’s Sexual Desire

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Otouto no Seiyoku Shori wa, Ane ga Suru Mono da to Onee-chan wa Omotte iru. | My big step-sister thinks that big sisters should take care of their little brother's sexual urges

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