Ehhh... you have a cannibal fetish? In really hope a read that wrong.
I hope so too.
Fantasies like these ones are better left repressed in the subconscious mind - its fine to live them out in dreams, as that doesn't harm anyone. However, if they become conscious desires, I suggest seeking professional help, as what you describe is highly pathological. I've done a lot of things in lucid dreams I would never, ever think about doing in real life because in the dream world there are no solid consequences for our actions (I still sometimes feel guilty when I wake up, as I prefer to use my subconscious mind as a place of learning, not as a sordid fun house). Anyway, even in the subconscious mind such violent and disturbing thoughts are not to be encouraged, but abolished, as they can leak over into your conscious reality, and then become problematic. As I said, if you are already, in your waking life, having such fetishes, I would request that you hire a good psychiatrist; its just safer for everyone else that way.