Haha, this made me smile. >.> I probably wasn't suppose to, because it's so dark and explicit, but I did anyway.
I thought you definitely got your point across and spilled your emotions into this. The flow was a little rocky, but that's okay, because you don't really notice it all that much.
Fu.ck this core of a life, bleed me with this knife,
^^ I can relate to that line so much. >.<
Watch the dripping red, I smile without dread,
^^ What I suggest here is that you change "red" to a more descriptive word. Just don't use crimson, because so many people use that now. I like the last part of the sentence though.
Laying in my blood puddle, only the devil is to cuddle,
^^ Haha, cuddling with the Devil. Brilliant. Wow, that throws some pretty weird mental picutres into my head.