Thor/Ton(i) Stark + Loki
“You did this to me!” Tony (or Toni as he was currently due to Loki’s stupid magic turning him into a chick about a year before) screamed at Thor who was standing in the room trying not to look very proud even though the currently female genius was screaming and cursing his name.
Christmas day the genius went into labor and was taken to the hospital. She had been cursing Thor, kicking Steve out of her room because the super soldier was being a worry wort and pissing her off, demanding Bucky cuddle with her because she was too angry to cuddle with her godly boyfriend, allowed Natasha to stay by her side mostly because you did not make demands of the black widow, and had been throwing random items at Clint with the excuse it was for science. Sam, Rhodey, Pepper, Happy, and Bruce had all wisely stayed clear of the very agitated genius who had never imagined she’d experience childbirth (mostly because she’d been born a man and no one should ever expect a god of mischief to suddenly turn someone into a very fertile woman)
Steve after being kicked out of the room again found Thor at his side full on grinning.
“Why do you look so happy? Tony has done nothing but curse your name since she went into labor.”
“Aye she has but I know she will be happy when she gives birth to our children. She has wanted a family and what else do you think would be the best gift to give her for this most joyous celebration?”
Steve looked at the god a moment confused.
“How could you have known Loki would turn her into a woman?”
Thor’s grin grew if that was possible.
“Oh god you asked him to didn’t you?”
“I wished to grant my lover’s wish. What do you mortals call it, a Christmas miracle?”
“Tony is going to kill you when she hears about this.” Steve warned.
“She need not know that I employed my brother for this task.” Thor assured him.
“Holy shit Loki?” That was Bucky making Thor pale as he turned back to the room where Loki stood.
“Hello Anthony, I’ve come to make this easy for you.” A quick work of Loki’s magic and the triplets were born easily via magic and the genius was no longer in pain or a woman. “I wish you the best of this Christmas gift my brother asked my help in giving to you.”
And like that the god was gone and a very pissed off genius was looking at a very pale Thor.
“Thor honey, come here a moment. I’m thinking this Christmas miracle would go great with a side of holiday murder.”
Tony passed off the triplets to each of the nearby avengers. Bucky and Clint were cooing at the babies they held while Natasha looked slightly awkward. Thor tried to outrun his lover but the genius was determined and out for blood.