Grass and Gold (слэш)

He lands on Midgard, on Earth, in a time that isn't his, surrounded by hostiles with quick fists and quicker jaws, but he's done something incredible. Something impossible. And he meets warriors in spandex skins and a wizard who shoots lightning from his hands and Loki thinks, This is good, and the Avengers do their best to keep fragile secrets hidden.
(In which nobody does a time-travel spell quite like Loki does a time-travel spell.)