https://hitomi.la/doujinshi/kyou-sei-renai-ore-to-ane-no-yuganda-kankei-english-275397-1431100.html
Oneefags, this is my absolute favourite doujin of all time. Nothing comes close to this villainess minx and I never tire of her systematic victory over her little brother. You never see a lot of male mind break, but this yandere only very briefly allows her otouto to get mindbroken and fuck away at her pussy, before pulling the rug out from underneath and bringing him back into the terror. She got everything she wanted and proved that little brothers belong to their oneechans.