hey, you asked for constructive criticism, and I've finally found the time to do so! (I should preface this by saying that I adore everything you've written so far, and I really hope that I don't come off sounding pretentious or anything.)
there are two big things that I personally have noticed while reading your works - though I've only read what you have posted here, so that may not include more recent works. the first is tenses. now, you've improved significantly since the beginning of your one-shot books, for example. however, the mistakes are still present and always fixable. for example, in 'H2OWildcat Drabbles' in the chapter 'Strong', the story begins in a form of present tense with "I especially don't understand..."; by the time you reach the third paragraph, it's "he managed to...", which you do stick with for the rest of the chapter. it's not an uncommon error, but it is something that our brains autocorrect, meaning that focused, thorough editing is the most effective solution for this. I completely understand the fevered 3 AM writing, just read over your works carefully before hitting that big ole publish button.
the other thing is time skips. now, I completely understand the purpose, and it makes complete sense to brush aside a few completely uninteresting hours here and there, but the way you've done it makes it seem the slightest bit choppy. it's natural and easy in 'Strong', moving straight into current day using the comparison between Delirious' weight and the bags. the one that caught my attention was 'Who is he?'. (I understand the automatic cringeyness of two-year-old fics, but bear with me here). in this fic, you skip days and sometimes weeks at a time, and again, that's perfectly fine here; the attention-grabbing issue is the lack of transitions. even something as simple as "six weeks later," instead of "it's been six weeks" makes for a smoother introduction to a new section - time period, in this case.