Who cooks: Sulu. Chekov isn’t all that good in the kitchen;
Who does the laundry and other chores: Chekov does the laundry and the dishes, the rest of the chores are equally divided between the two of them.
How many children do they have: Two girls and one boy.
Who’s more dominate: They both can be very dominate, it really depends on the day/mood.
Favorite nonsexual activity: They like talking, they talk about everything and nothing, and hours and hours pass by with them just talking.
Their favorite place to be together: I don’t think Sulu has a ~favourite~ place, he just likes being with Pavel and Chekov likes when they’re in Sulu’s greenhouse. He loves the way Hikaru takes care of each and every plant and the look he gets in his eyes while doing so.
Any traditions: Once every year they go to a different planet they haven’t gone before and just take the week off to be just the two of them with no worries.
Their “song”: The one that comes to mind right now is Warmness of The Soul by Avenged Sevenfold.
What they do for each other on holidays: Sulu buys tickets to Russia so Pavel can meet with his family and Pavel always finds a new rare plant to give Hikaru, who has no idea how Chekov finds them, but he doesn’t ask because he likes the surprise.
Where did they go for their honeymoon: Some lost, isolated island in the middle of the ocean. It was Kirk’s present.
Where did they first meet: Starfleet Academy.
Any pets: They have three cats, two dogs, a turtle, a bunny rabbit, and four aliens pets. Chekov can’t resist them and Sulu can’t resit Chekov.
What do they fight over: The silly littlest thing, mostly Sulu’s over protectiveness.
Do they go on vacations, if so where: They go on vacations whenever they can and go every possible place they can. Be it to a little town just an hour away or to a planet in another system.