I Am In Love With My Elder Sister's Husband...Help Me!

I am a lady of 25-years, staying in my sister's house in Lagos. She payed my elementary, middle, high, & she is even paying my university fees for me. Also, she gives me whatever I ask for. The problem is that, I have developed a strong feelings(love) for her husband. I started dating her husband when I was in SHS 2. He loves me, I love him. We really love each other. He said he made a mistake to marrying my elder sister, but I am the one he loves. I love my sister's husband so much, & he is a real business man, physically strong, both in bed & money. Now, he wants me to be his second wedded wife. But I also do not want to be a second wife. What I want him to do, is to divorce his wife(my elder sister). Not knowing, all what we were saying in the room, she heard it. Came in & threw hot water on me, fought with me, & bite my ears. I just recovered 4-days ago. Still the man wants to be with me, but the obstacle is my sister.

Please help me, what should I do ? I want to kill my sister to get her husband. I really love the man. (No insult) ♥

Can i kill my sister??