Loki's wife meets the avengers
What if...
Sigyn, Loki's actual wife from norse mythology and marvel comics, decides she is going to visit her husband who is being kept at the tower as part of his punishment. When she gets there she announces that she's there to visit her husband. Thor, however, gets this look of utter horror, telling them that Sigyn is Loki's wife. thor tries to greet her but she shuts him down with the "Bitch, don't even" look. He, of course clams up, while she leaves them to find Loki.
There is a nice, akward discussion about "Loki" having their brother killed and Loki's punishment for that transgression (Loki and Sigyn's sons being killed in retaliation and Thor's part in the act). i quote Loki because , lets face it, even Loki isn't dumb enough to go to Helheim with Thor, who has a notoriously violent temper, to seek the man "he" tricked into killing their brother, whom everyone adored. Like seriously guys, did they even THINK about this before butchering a couple of kids as punishment? Plus there is the whole 'traveling alone with my ill-tempered brother who I'm not really related to' thing to consider.
Anything after this is pyre bonus on you guys half.