Wasn’t there an interview where he was asked if he wore the helmet to bed, with his reply, “You mean if Loki’s horny?” or some such…I’ll have to search for that. And there were some comments of ‘metal and leather is how they do it on Asgard.’ in reference to Loki’s garb. I recall a few selfies of him in Loki’s gear, and at least one with Kat Dennings, with a good Loki smoulder goin’ on. [She was so into it: just my headcanon…] And we all remember the famous ‘Say my name!’ demand from SDCC2013.
Those were all good bunnies, but I don’t recall any actual fanfics about it, though. Time to fire up the laptops, eheheheheh….
I’d just like to remind everyone that it is Athelstan he is looking at like that whilst asking him to come have sex. If you have a problem with the romantic/sexual pairing of these two men, then I would suggest you take that up with the show’s creators, because THIS is canon.