Sibling love

Recently I have found that I have a strong attraction towards my brother. I know this kinda sounds strange but as the older sister I feel obligated to protect him, however this has led to almost all my thoughts, actions and thinking be in favour or have something to do with my brother. However I feel as though this is more than just sibling love. I feel as though there is something more special with us. Whenever he comes out of the shower he only has a towel wrapped around his body when he walks to his room and I can say that I am 100% attracted to his body and it really turns me on. I want him to be something more than a brother to me, however I feel that asking him will jeopardize our relationship. I often frequently fantasize about being with him sexually, and masterbate over him on a regular basis. Please let me know your thoughts if you think this is right or wrong.