Harmless Obsession for the Captivating Male Lead

I reincarnated as the villain’s younger sister who will be killed by the male lead. It was a forgone conclusion that my brother and I will die to the male lead if my brother continued his evil ways. So, I tried to live quietly while trying to change my wicked brother, but for some reason the male lead was lying in front of our villa? I couldn’t let him die, so at first I helped him up, but…the male lead’s condition was a bit strange. Wait a minute…did it start already? The male lead’s mana congestion? There was only one way to calm the raging mana within the male lead’s body. Immediate physical contact… But that’s the female lead’s job! Aren’t I the villain’s sister? Why me?! What the hel...