Beautiful little king snake! Andfor noticing & getting the eye-cap off too. I'm no good at guessing king snake tails, they're too ambiguous to tell by just looking. (Needs gentle tail popping if you know how or probes if you've been taught.) Large pinkies first, graduating to fuzzies should be fine, btw. He doesn't look starved either, though sometimes snakes "inflate" when stressed by handling & transport, so that's not an 'absolute' either, but he looks quite good.
I think you're going to enjoy this little guy (or gal). By the way, they're only about 8" long & skinny like a #2 pencil when they hatch, so this is not fresh out of the egg. As Charles8088 hinted, you might get musked or tail-squirted in self-defense: kings don't have a big enough gape to bite effectively, so their self defense as hatchlings involves the other end, lol. But my MBKs weren't bad about this at all- they outgrew it quickly with gentle handling, & this one already looks pretty comfortable with you.