Cause it isn't
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I'll lick boots for a living if it allows me to afford my own home and support a family on a single income. I imagine I could get very into it.
"I see master is wearing their black versache dress shoes today, excellent choice sir! I will lick them clean all over. Oh, is that shoe polish? You shouldn't have!" slurp slurp
My wages only cover literal boot licking.
I've seen those YouTube videos too