Domesticity meme: ObiKaka (duh!) and ObiRin :)
Doing ObiRin for you, OK? See ObiKaka below :)
 who cooks normally?: Rin, though Obito has a few signature dishes he likes to pull out every now and again.
how often do they fight?: RARELY! Obito’s honestly just so happy to be with her that he never starts anything, and if Rin’s temper is ever short, he agrees with her quite readily.
what do they do when they’re away from each other?: Rin (assuming she survives, AU) is an attending at the Konoha hospital (Ophthalmology, I figure~!), and Obito’s a Special Jounin. Pretty involved jobs.
nicknames for each other?: Standard fluffy endearments (honey, sweetie, darling, dear…).
who is more likely to pay for dinner?: Obito, even though Rin makes some good coin. Once they’re long-term they just alternate.
who steals the covers at night?: Neither—they sleep too close together for it to matter.
what would they get each other for gifts?: Obito would go with the standard things; flowers, chocolate, jewelry, negligée if he’s feeling bold. Rin would be hands-on with things like massage for Obito (which is partially therapeutic since his musculature is all warped from the crush injury), or making his favourite foods, or some cool new gadget (aka a toy for a grown man).
who remembers things?: Rin’s good with dates, but Obito’s practically obsessive about them. She’ll remember their anniversary or his birthday or things like that… He’ll remember the first day he made her laugh, the first time they went to the park together, the first time they went out to dinner together. Down to the date and time.
who cusses more?: Obito, but only because Rin generally doesn’t.
what would they do if the other one was hurt?: Rin would jump in and heal allll the wounds. Obito… well. Yeah. bloody screaming murder.
who kissed who first?:Â Rin kissed Obito. He would have been rambling nervously and fidgeting as the atmosphere between them changed. Rin would lean in and kiss the poor guy to put him out of his misery and move things along.
who made the first move?: Obito, when he finally got the sense to ask her out on a proper date.
who started the relationship?: Rin, the day she referred to herself as “your girlfriend,” while talking to Obito. Obito was stunned for a long moment, then beside himself with joy.