I don't know why, but I always tought Thor like asomeone who likes being assf..ked. And a lot. The same with Cap. They just do not seems to fit in the top role.
BTW, the mighty Thor offered himself to test one of the new products of the Stark Industries... (Maybe it will be added at the Iron Man armour set)
Something like... Thor: "Hey, Tony, isn't there something bigger to make me try?"
Iron Man: "Maybe we could make you try the Hulk Model!"
Aaaah....right there! Yeah!
Like i said , Steeve Roger, like Thor, always seemed to me someone who loves having things up his ass. Big things.
That is the situation: Seeing that Thor had so much fun with the new products of the Stark Industries Cap decided to ask Iron Man to test the "Thing model" (or maybe the "human torch model" fits better) of the series.
It seems he is liking it a lot.