A Way to Protect the Female Lead’s Older Brother

True author is Kin I accidentally possessed someone from a R19 harem novel! The problem is that the person I possessed is Roxana Agriche, the older sister of the secondary villain! Now my damned father has kidnapped the heroine’s older brother! The way things are going all that’s left for he is to meet a terrible end at the heroine’s vengeance! But what if I save the brother?