The Way to Protect the Female Lead's Older Brother is a Manga/Manhwa/Manhua in (English/Raw) language, Fantasy series, english chapters have been translated and you can read them here. You are reading The Way to Protect the Female Lead's Older Brother chapters on ManhwaZ, fastest updating comic site. The Summary is
I accidentally took possession of someone in a 19+ reverse harem novel. The problem is that I became Roxana Agriche, the older sister of the sub-villain. My damn father kidnapped the heroine's brother.
Now, is the only thing left to meet a terrible end from the vengeance of the heroine? But what if I can avoid that horrible development?
“I'm also interested in this toy.” 'I'll protect you until you can get out of here safely.'
The heroine's brother, Cassis Pedalian, will definitely be able to pay me back later.