I'm Afraid of the Dark, Mr. Stark

There's a large mess consisting of a sick aunt, a teenage boy sneaking out in the middle of the night to freeze in alleyways wearing nothing but a red and blue spandex suit, an actual dad billionaire who doesn't know how to be a dad but he was thrust into this position and has no actual clue what he's doing despite being a genius, some villains, some heroes, and an irrational fear of the dark.

(written on ao3 as lildouglas, art not mine)