You're Not A Horse, Harry!
“So you’re my dad,” Harry said to the large, blond one. The one with the hammer. Supposedly a god, even.
“Yes, I have conceived you myself!” His ‘father’ said with a huge, beaming smile.
“With your brother,” Harry said very slowly, very carefully. “Who is apparently my mother.” Harry gave the tall dark-haired one a good, long look. Yes, there were similarities between their features, even Harry could see that. Hair, eye-colour, the shape of their nose and mouth.
In which Harry is the product of a prank that Loki once played on Thor. But hey, at least he's not a horse, so there's that.
A series of vignettes about Harry's life with the Avengers while getting to know his new parents.