Siblings
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Source? for a friend....
Saucenao says:
https://x.com/kugatu28/status/1613445192769732609
& [Index #18: H-Misc (nhentai) - 15t.jpg] - Ore no Koto ga Daikirai na Imouto ga Kowai _ My Sister Who Cannot Stand Me Is Scary [English]
I didn't even know the source on this one but that makes sense
Basically imouto starts loving onii chan after being told they are not blood related and starts acting tsundere. All you get as H scenes is imouto masturbating.