The Way to Protect the Female Leads Older Brother

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 subvillain My damn father kidnapped the heroines 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
Im also interested in this toy
Ill protect you until you can get out of here safely
The heroines brother Cassis Pedalian will definitely be able to pay me back later