Bogertophis's reply is spot on.
Juvenile Kings are tiny and EVERYTHING seems like a predator to them. So they musk to ward you (the predator) off, hoping the smell will make them unappealing and therefore, you won't eat them.
The grow out of this stage as they put a little size on and gain confidence..... but this takes time. Be patient, hold off on handling (plenty of time for handling in the future, don't sweat it).
I would wait until three consecutive meals without refusal starting now. Restart the clock as if you brought your snake home today. Let the animal acclimate and gain confidence, it's been a wild ride the past few weeks for the little guy.
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