Britt and Sam! With the first set of questions (I might do the second set later, depending on how long these all take, because Bram are fun):
big spoon/little spoon:
It depends on what they're watching. Sam's pile of favorite movies is legendary, but Brittany's got a whole bunch of big cat documentaries and shows/films about talking animals and cheerleaders and Disney characters, so they trade off. When it's Brittany's pick, she'll wrap himself around behind Sam so she can feel if he goes tense at the exciting parts or his attention wanders off, because half the fun is Sam's reaction, obviously. Sam does the same thing when it's his turn, but he always tucks his chin over Brittany's right shoulder so that he can point and gesture with his right hand, just to make sure she doesn't miss something important.
Spoons are for cuddling on the couch and movies on the laptop, not so much for actually going to bed. They both tend to sprawl, for sleeping, and they end up tangled sideways in weird combinations, Sam's hand curled around Brittany's knee and Brittany's head in Sam's armpit. Waking up in the morning can be an adventure.
favorite non-sexual activity:
Let's Figure Out Why. Blaine's a great friend, and he'll let Sam drag him along on certain things--and superhero club was TOTALLY all about Blaine, let's not kid ourselves here--but Brittany won't just follow along with Sam's ideas, she gets them, and she'll run with it. Every once in a while, one of them will mention some kind of crazy phenomenon that nobody else in the world seems to find weird, like how stoplights always know when to say stop or go, and they'll try to figure it out together. A lot of the time, it's aliens. Aliens, it turns out, are responsible for a LOT.
They're both aware that the explanations they come up with probably aren't in tune with what most of the world believes, but most of the world is, to put it quite frankly, kind of stupid. Anyway, being actually, factually correct isn't really the point here. This is their, world, Sam and Brittany's. And besides, it's fun.
who uses all the hot water:
Brittany is far more likely to lose track of what she's doing in the shower and get stuck until the water turns cold and she has to get out. Sometimes, if she's been in there for a while, Sam will tap on the shower curtain and ask if she wants company--a little bit to help her out, but mostly also because Sam wants a shower before all the hot water is gone, and showers with Brittany are fun.
On days when they've been doing a ton of dancing, or Sam's been playing a lot of football, and his muscles all hurt, though, he will stand in the shower forever and not even feel sorry. Brittany rubs his back, afterwards, and also mocks him, because she's been dancing for so long that the muscle cramps are, like, the easiest thing to deal with ever. Much more straightforward than trying to remember what order you shampoo and condition in.
most trivial thing they fight over:
Hogwarts/Power Rangers/that animated Avatar thing. It all started out in good fun, but then Sam had the poor judgment to argue that Pocahontas had the makings of a great red ranger, and Quinn was obviously a waterbender, and then put Han Solo in Gryffindor, and then, well, it was on.
Sam defers to Brittany's judgement when it comes to pairing people with daemons, and they both agree that superpowers should be a personal choice, and not something externally imposed. They are, however, probably going to debate over how to Sort Britney Spears for the rest of their lives.
who does most of the cleaning:
Lord Tubbington, obviously. Haven't you seen the youtube video? That thing went viral. (Sam is good for anything that involves heavy lifting.)
what has a season pass on their dvr/who controls the netflix queue:
So, technically this is Sam's domain, because Sam gets so excited over his shows and movies, right, of course. They switch off, though, in terms of when they watch what, and Brittany gives Sam Very Specific Instructions about making sure that certain things get queued up or DVR'ed that Sam is always very careful to follow.
who calls up the super/landlord when the heat’s not working:
Brittany. Sam tried to take care of it the first couple of times before Brittany noticed, because having to deal with shitty landlords sucks and Sam's a gentleman like that. The first time Brittany had to go see the superintendent about repairs, she stomped downstairs in a sports bra and a furry winter hat because the heater wouldn't turn off, so it was the hottest part of summer inside, and winter outside, and seasons are confusing, and the super needed to fix it now.
By the time she actually graduated high school, Brittany had perfected such an effective mix of dumb blonde and evil genius that Sam could only watch in awe. Not only did the super fix the heater that day, he made the dishwasher stop making that clanking noise and promised to see about getting them a discount on the rent if the heater acted up again. Sam was more than willing to let Brittany deal with the guy after that.
who steals the blankets:
Both of them, although Brittany's definitely worst. They have half-asleep blanket fights, which is a big part of how they end up tangled in such weird positions in the first place. Of course, there would be plenty of blanket to go around if Lord Tubbington didn't claim half of them as his right, but, you know, it's Lord Tubbington. What can you do.
who leaves their stuff around:
Sam's worse about this than Brittany. Brittany has to know exactly where things are supposed to come from and go to in order to find anything, and she totally forgets things in really weird places sometimes, but because she's not good at keeping track of things, Brittany works at remembering where things come from and where things go. There are routines. Sam doesn't have to try as hard, so he doesn't try as hard, because he can find his shoes in the morning whether he leaves them next to the door or the couch.
who remembers to buy the milk:
Sam. Sam is still really good about things like grocery shopping. He still always buys bargain brand everything (the less said about the trip Sam and Brittany took together to Costco, the better, although they enjoyed themselves a whole lot), and he's big on coupons. Brittany sucks at dealing with money and she gets that it's a thing for Sam, so she is more than happy to let him have it.
who remembers anniversaries:
They remember really weird anniversaries, like, the anniversary of the first time that they ate at a restaurant that wasn't Breadstix, or the anniversary of Sam meeting Lord Tubbington for the first time. Brittany remembers some of them, although it's always up in the air how close she gets to the actual date of the anniversary; whatever, it's been a year in some planet's orbit.
Sam always brings Brittany flowers on the anniversary of the day the world didn't end, because they did kind of get married. He has to explain why every year, but they always end up eating Mexican food and watching terrible old B-movies about the end of the world.
Neither of them has any idea what the anniversary is of the day they got together, first kiss, first date. No clue whatsoever.