Nothing's gonna harm you, no sir, not while I'm around
Demons are prowling everywhere nowadays
I'll send them howling
I don't care, I got ways
No one's gonna hurt you,
No one's gonna dare
Others can desert you,
Not to worry, whistle, I'll be there!
For Ciel and Finny, as friends, bros, or something more. That gardener will protect his little master from all harm, no matter what.