Yes, it's MCU. The pairing is Tony Stark/Loki. Frost comes from Frost Giant (which Loki is in Norse Mythology and in Marvel), and the Iron comes from Iron Man. I read a few (there are tons) comics during my teenage years, and it still took me a while to get into it. I've only started to watch the movies this year (and some are super cliché action movies, and don't get me started how dumb I think some of the characters are). But I love -LOVE- norse mythology, and always had a soft spot for Loki in all his forms. And yes, Tony and Loki are smart ones. So it only needed a bit trial and error before I've found my favorite pairing.

Great, that you loved to see them. *dances with glee*
You should tryt to see Placebo one day. Brian Molko has a brilliant voice. :D