Ah yes. These two never stop on being such an amazing pair in the game.
Who asks the other on dates: I think Hibiki most of the times; Yamato might do it once or twice, though he will phrase it as an “outing” of some sort and Hibiki will indirectly turn it into a date. Their dates will mostly be sightseeing in Japan (or in special occasions like vacations, outside of Japan) and going through street food stalls or festivals. Something new, refreshing, and tranquil for Yamato.
Who is the bigger cuddler: Hmm, Hibiki; I feel like Yamato feels this kind of gesture is distracting whenever he’s on work or sleeping.
Who initiates holding hands more often: At the beginning, it’ll be Hibiki. As Yamato gets accustomed to the holding hand ritual initiated by the rabbit-hooded hero, I would like to think Yamato absentmindedly holding Hibiki’s hand while the two are working on some papers on the couch, getting comfy.
Who remembers anniversaries: Both, though they won’t do anything special for their anniversary (whether it is the anniversary they first met, or Yamato’s first time eating takoyaki or doing civialian-related things). I think they’ll go with the usual visiting places for leisure.
Who is more possessive: Yamato, for obvious reason (basing on his quote “You are the ones that corrupted him!…That ends here. I will slit your throats and see that he comes to his senses!”)
Who gets more jealous: Neither?? I just believe these two have such unwavering trust, loyalty, and such that it shouldn’t make them question their relationship
Who is more protective: Both sides.
Who is more likely to cheat: Cheating as in seeing other people? Neither. Cheating as in playing board games or any other sort of games? Neither as well.
Who initiates sexy times the most: Hibiki. I can’t really imagine Yamato being the one to start it.
Who dislikes PDA the most: Yamato. He has to deal with Hibiki’s once-in-awhile sneaky affectionate attacks while at work.
Who kills the spider: Neither. Yamato thinks it’s a waste of time to kill an insignificant tiny spider. Hibiki will either ignore it or just set it outside.
Who asks the the other to marry them: Oof, not sure. Maybe Yamato???
Who buys the other flowers or gifts: Yamato doesn’t need any other gifts, as he suggested in the game. Hibiki will keep insisting though on what he wants (besides a plate full of takoyaki).
Who would bring up possibly having kids: Neither.
Who is more nervous to meet the parents: Hibiki. He always wondered what kind of family are the Hotsuins and seeing how they raised Yamato into such a man made him imagine them being one of those wealthy and tense family striving for perfection and would easily give any kind of disapproval.
Who sleeps on the couch when the other is angry: Hibiki - sleeping on the couch. Yamato - the angry one
For whatever reason brought this scenario, I could imagine Hibiki trying to catch a snooze instead of working while Yamato is glaring at him.
Who tries to make up first after arguments: Hibiki. Yamato doesn’t really know how to reconcile after a quarrel; he’s still socially inept after all.
Who tells the other they love them more often: Hibiki, but at the same time, I feel like they don’t need to say it too often as they already knew.