Just as the title implies. I'm looking for a yandere brother who %100 control his little sister. As an example for what I'm looking(it doesn't have to happen in the manga), let's say the sister brings a boy who is just a friend(or an actual boyfriend) and then the brother takes her aside afterwards and slaps her for not asking for a permission or something like that. I want the sister to be extremely afraid of him.

Can be hentai! I prefer no one-shots but they will do too.

Its not perfect fit but...Mon Seul?

Quote from rhin33

Its not perfect fit but...Mon Seul?

Thanks.

I've got partial matches for you. Most of them, the sister isn't really afraid of the brother. The brothers' are just possessive and mildly controlling.

Oujitachi wa Izonsuru - All the stories are bro/sis themed with possessive older brothers. In one of them, the sister is mildly scared of her brother.
Conflict Lovers - Chapter 4 "Wild Rose's Crown." Brother takes care of little sister like a pet/doll.

The following are hentai titles. Most are one-shots, though. It's hard to call "yandere" when most hentai are plot and characterization light.

Kinkyori Renai (MAKA Fushigi) - Chapter 4 "Short Distance Relationship Cousin" Maybe. Girl doesn't seem to like the abnormality of their relationship.
Birthday (Yukimi) - Chapter 12 "Normal Blood." Big maybe. There's just not enough story to be able to tell. Rape.
My Brother Is The Worst - Girl is initially scared of her brother because he wants to sex her up. And then hentai happens. Rape.

You've probably read it already but Zero at the start feels a lot like that. Not sure if the male lead can be considered yandere but he's definitely psycho at times. Warning : Incest although I don't remember any explicit scenes.

Thanks for the recommendations!