Lesson: Do Not Look For Fish At Midnight (re-written)

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Have your parents ever told you not to run down a large hill at midnight, kneel over the edge of pier while not knowing how to swim, fall in, almost drown, and maybe just maybe find yourself a merman?

Killua's certainly haven't.

Cover pic credz to Kiekyun B)

(Hello, author here. This fic is currently being rewritten so if you notice a change in writing voice don't question it :))
Chaps rewritten: 2/??