SEND ME A SHIP and i’ll tell you:
who wakes up first in the morning: In a world where both sleep, Yellow. And she might prepared her breakfast even –of course, in a magic world where at least Blue eats. Spoilers: Yellow might try to make the perfect(TM) together breakfast and it involves lots of chocolate.
who’s the first to fall asleep at night: Blue. But she is very likely to get up in the middle of the night just for check on Yellow and put an extra blanket for her, snuggle or whatever.
what they playfully tease each other over: Warning: this can be very very fluffy, silly and everything nice. I imagine Blue teasing Yellow every time she makes a pout or rolls her eyes --wich is very common to happen--, and Yellow teasing her about being a crybaby --of course, not about sensitive topic as Pink, but for things as, idk, broke a nail. As for /another/ kind of teasing, I'm pretty positive about the fact that Blue likes to go under Yellow's desk for very professional purposes and that also Yellow enjoys to touch her in public --without the public noticing of course-- for equally professional purposes.
what they do when the other’s having a bad day: Sing for each other and have a breakdown in the process? OK, being serious, I believe singing as a great part on that kind of situation anyway. So yes, they sing or they stay in silence holding each other. For Yellow, that suffices.
how they say ‘i’m sorry’ after arguments: Both of them are really bad at apologizing with each other! So they don't do it with words, but little actions instead.
which one’s more ticklish: Yellow, but this is top secret information.
their favourite rainy day activities: I can picture them controlling a storm, LOL. But aside that, I believe snuggle and maybe some kinky stuff.
how they surprise each other: Little gifts, little words and little kisses.
their most sickening shows of public affection:
