Lust's Winter comes ere Summer half be done (слэш)

When Jotunns come to Earth to establish a trade and to sign treaties, Tony gets asked by the heir Loki very nicely if he wants to share with him his heat. Cue cultural differences concerning how to raise a kid. While on Earth Omegas pair off with Betas to raise the child and the Alpha provides resources and child support, on Jotunheim Omegas pair off with their Alpha to raise the kid.
Tony is suddenly forced into a parental role and doesn't know what to do while Loki clearly does.