Female Leads Older Brother Roxana

This book starts at chapter 49 there is another book on Webnovel that reaches chapter 50 so read that first

also this is fan translated so curb your standards.

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.