 If you liked
Boku wa Imouto ni Koi wo Suru
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 ...then you might like
Do S na Oniichan to no Atarashii Koi no Hajimekata Oshiete Kudasai!
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Forbidden love stories between siblings. Both works have a creepy and possessive Brother/Step Brother who harms Sister/Step Sister emotionally and physically. Both works have a somewhat dark feel to them, although Boku wa Imouto is more light-hearted, with some Comedy elements to it.
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Recommended by Little_Sheepling