Hi there anon! ^_^ yuuss Servamp okay here we go:
• Drinks all of the coffee
Kuro drinks the most coffee and never tells Mahiru when they’re nearly out. So when Mahiru actually does feel the need to have some - being a mother is hard work I mean what - there’s NEVER any left. (Kuro brings cranky Mahiru’s wrath onto himself. You could have avoided this, Kuro).
• Brings up adopting a pet
Mahiru has talked about maybe getting another cat - a ‘normal’ one - but Kuro believes there’s no need as he literally has the cutest kitty ever to grace this earth right in front of him. Why on earth would Mahiru need another one? (Jealousy is a terrible thing, Kuro).
• Kills the bugs
If Kuro can physically reach the bug from where he is sitting he’ll kill it, otherwise it’ll stay in the apartment unit Mahiru lets it out the window - Mahiru doesn’t see the need to kill it if it’s not doing any harm.
• Cooks the meals
Mahiru usually does. Someone has to make sure the Kuro doesn’t ruin himself by living on instant ramen and junk food all the time. (Mind you, I really believe that Kuro is secretly perfectly capable of cooking for himself. He just prefers to have Mahiru do it).
• Starts getting into the holidays way before they should
I can’t see either of them getting super excited about it in a really obvious way? I think it would be subtle things - Mahiru cleaning the areas where decorations will go up, Kuro giving advice on what he thinks should go where but adding “it’s up to you” at the end so it’s less direct, Mahiru leaving bowls of sweets casually beside the door at Halloween like it’s no big deal.
• Initiates the couple selfies
Mahiru insists on getting some photos of them together just to have them - “I’ve got photos of everyone except you! You live here too, you know”. Kuro claims it’s annoying but he secretly loves it.
• Forgets the birthdays and anniversaries
It’s not that Kuro forgets, he just… Doesn’t keep track of them? Like, he has a rough idea of when things happen, but he never really gets the dates right. Mahiru has everything in his diary. He never forgets anything.
• Always ends up with too much junk food after the grocery shopping
Kuro, of course. There’s a marathon of one of his favourite shows coming up and you bet he’s going to stock up on every kind of junk food ever. Is he going to get up at all during this marathon? Like hell he is. There has to be enough to last.
• Nicknames the other
I can’t see them being the nicknaming types, apart from Kuro calling Mahiru “mother” to annoy him :’)