Ah! I have three recs, then, all of them quite different, so idk if you will be interested in all of them. Anyway:

kinkmeme fill: Lex/Loki: what it says on the tin! I was kind of excited about this one because it understands them both a lot.

The Incestuous Elephant in the Room: Thor/Loki; the other Avengers are seriously uncomfortable with their relationship, Thor doesn't get what the problem is, and Loki cheerfully fucks with everyone. This one is screamingly funny.

The Later Edda: Lokisaga, or the Thor film retold as an Old Norse prose translation about Loki. This one is so, so great.