OKAY *rolls up sleeves* headcanon meme: First Date+Flatmates. First Time on their own with a newborn+Plus One and/or canon. Fighting/arguing+canon. Sick+Except You. Snuggles+Anna Begins. Getting Hurt+Bowl of Stars. Stargazing+Bowl of Stars. Nightmares+Close Quarters.
Well you don’t get the Bowl of Stars ones because reasons. But you may have the others.
First Date+Flatmates. - Anna insisted on an official First Date but it was a bit weird because they already knew each other so well. Anna also took great delight in kissing Kristoff goodnight demurely at her bedroom door, then closing it and going to bed. Then getting up half an hour later to join him in HIS bed.
First Time on their own with a newborn+Plus One and/or canon. - I think in canon the first time they were properly alone with a newborn (as in completely responsible for it) was when they took it to meet the trolls. Kristoff had never driven the sled that slowly before.
Fighting/arguing+canon. - I have Anna as someone who gets angry, lets it all out, then five minutes later feels terrible and apologises. Kristoff is a sulker and needs a bit more time to come round, and he can’t keep up with the shouting anyway, so it’s just as well they don’t have many serious disagreements.
Sick+Except You. - Kristoff comes to the palace to see Anna and is told she’s not well, in a very so-off-you-go voice. He asks if he can just see Asta for a minute and ends up spending all afternoon playing with her in the nursery, then sneaking into Anna’s room once Asta’s asleep.
Snuggles+Anna Begins. - happen frequently.
Nightmares+Close Quarters. - Anna has a key to Kristoff’s flat so when she has weird pregnancy dreams she lets herself in and climbs into his bed.