It's symbiotic

It's symbiotic
Scratchy:I don't know why I trust him
I guess some cats just never learn
Itchy:I feel so good when I have crushed him
Or left him mangled, maimed, and burned

Both:I supposed it's symbiotic
And perhaps a bit erotic
Scratchy:'Cause pain is my narcotic
Itchy:You really liked it?
Scratchy:Yes, I loved it
Both:And that's why we're always...
gItchy:Fighting
Scratchy:and Biting
Itchy:And dynamite igniting!