I'm looking for a fic I read a few weeks ago.
Steve holds onto Loki as he vanishes from Midgard to Jotunheim. The cold there is so intense that Loki has to transform Steve into a Jotun for him to survive. They're hostile at first, but gradually friendship begins to grow between them, as they prepare a coup with other Jotuns to boot off a false Loki and seize the throne for the real one. I remember a scene where Steve taught Jotuns how to fight with snow balls.
It was longish, and I thought I read it off AO3, but I can't find it now. Help?