For the domesticity thing: do Bruce and Betty !!
big spoon/little spoon: Betty’s the big spoon to Bruce’s little spoon
favorite non-sexual activity: SCIENCE
who uses all the hot water: Betty
most trivial thing they fight over: their separate things getting lost in messes to the point where they’re not sure whose stuff is whose.
who does most of the cleaning: Bruce
what has a season pass on their dvr/who controls the netflix queue: Betty
who calls up the super/landlord when the heat’s not working: Betty
who steals the blankets: Bruce
who leaves their stuff around: depends on the kind of stuff but Betty I guess
who remembers to buy the milk: Betty
who remembers anniversaries: neither. they suck at things like that
Who cooks normally? Bruce
How often do they fight? About once a month but it’s closer to bickering than outright fights.
What do they do when they’re away from each other? Send each other little gifts to assure the other that they miss them.
Nicknames for each other? I mean they’re technically already referring to each other by nicknames but in terms of pet names “honey” is pretty common. Occasionally though Betty comes up with a Hulk related nickname.
Who is more likely to pay for dinner? Bruce
Who steals the covers at night? Betty
What would they get each other for gifts? Bruce gets Betty flowers and other types of plants. Betty gives Bruce t-shirts with science puns on them
Who kissed who first? Bruce kissed Betty
Who made the first move? Betty
Who remembers things? Neither really.
Who started the relationship? Betty
What would they do if the other was hurt? Bruce looses his shit when Betty gets hurt. When Bruce is hurt Betty doesn’t quite do that but she will tell off whoever hurt Bruce strongly (if Bruce hurt himself she tells him off)