Eridan Meta, Part One/Who Knows

So, I was reading a perfectly decent Eridan fanfic one day. No woobie apologism or anything. It had Eridan going underwater to meet Feferi and feed her lusus and being miserable about it, an element that's popped up in various fanfics. And suddenly I remembered that we've seen her lusus feeding before, and it never required Eridan to do any such thing, and that if he'd been visiting Feferi underwater she probably wouldn't have said he never goes underwater.

And I started to consider Eridan's character and to what degree the fanfic versions are built off canon. Eridan has few pesterlogs and was never a major character, so it's actually quite easy to reread his appearances.

( Let's start at the first log. )