Hsin/Boyd for the ship thing
Extra late answer but here we go:
Who accidentally pushes a door instead of pulling/vice versa: Hisn. And when it happens he pulls/pushes the door even more just to prove the point. (That’s why they live in an open space).
Who doodles little hearts all over the desk with their initials inside them: Of course Boyd. And each one of them is a little work of art.
Who starts the tickle fights: Boyd. Because Hsin gets annoyed and usually clenches his wrists together to make him still. Boyd is v much turned on by that.
Who starts the pillow fights: Hsin. And they don’t stop until the house is a complete mess of white feathers and ripped pillows. The poor guy has to take out all his fighting instinct somehow so let him live.
Who falls asleep last, watching the other with a small affectionate smile: Both. Mostly because they are afraid of falling asleep and not finding the other by their side when they wake up, since all the shit they put them through.
Who mistakes salt for sugar: BOYD. Keep the guy away from the kitchen for the sake of humanity.
Who lets the microwave play the loud beeping sound at 1am in the morning: Hsin. But he gets annoyed himself and smacks it every single time. They already bought 7 microwaves.
Who comes up with cheesy pick up lines: Boyd that sappy ass.
Who rearranges the bookshelf in alphabetical order: Hsin. He likes to have all his book well organized and away from Boyd’s color tainted fingers.
Who licks the spoon when they’re baking brownies: Hsin. He’s the ultimate tease and we all know that.
Who buys candles for dinners even though there’s no special occasion: Boyd that sappy ass strikes again.
Who draws little tattoos on the other with a pen: Both, but Boyd is on a special quest to draw Hsin’s back completely. He also like to paint on his skin, but that’s another story....
Who comes home with a new souvenir magnet every time they go on vacation: Neither. They’ve been in so many places they don’t want to remember.
Who convinces the other to fill out those couple surveys in the back of magazines: Hins. Like father, like son.