I am looking for a fic (probably on fanfiction.net) that I read where Loki visits Tony in his tower. Tony is freaked out at first because Loki is supposed to be in jail. It is then revealed that Loki, is in fact, still in jail on Asgard but is projecting his likeness to visit Stark. I remember one scene is them drinking at Tonys bar and Loki playing with the ice, this somehow reveals to Tony that Loki is just a projection.
There meetings continue for awhile, sporadically,and they both bond through talking and getting to know one another. If I am not mistaken, Loki does eventually either get released/escape from prison and Frigga makes a brief appearance at the end?