Part One - “Don’t we have enough personal problems?”
Ship all the characters. There are no rules, you may use any criteria you want and yes, Mjölnir counts as a character.
All characters not depicted are otherwise occupied. Either saving the world or participating in the bi-weekly orgy at Xavier’s. Your choice.
Part 1.5 - “The one where Steve goes on a date.”
Part Two - "Having kids can only decrease the odds of our enemies killing us. Because they’ll shoot them first."