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At the beginning they call each other by their last names, but Kagami quickly gets used to calling Akashi 'Sei' and likes to tease him about it in public

That is, until he noticed that Bokushi didn't appear to like the nickname much, and started calling him specifically 'Juurou' which he seems to like more

Akashi, for his part, doesnt start calling Kagami 'Taiga' until well into their relationship for a variety of reasons (1. He's afraid of the connotation with using given names considered Kagami's history with Bokushi and 2. He was afraid of using more intimate callings because he wasn't sure their relationship would last)

In general Akashi is the more insecure one in their relationship, constantly worrying that he'll do something to finally push Kagami away despite all his assurances that that'll never happen

Kagami's main love language is cooking/baking, and he tends to surprise Akashi with his favorite meals after particular bad days to help cheer him up

Akashi's main love language is spending quality time with Kagami, as thats something he values especially with his busy schedule; gift giving is also a large part, but he reserves that for more special occassions such as birthdays and anniverseries, since Kagami tends to get awkward with the more lavish gifts Akashi gives him (despite Akashi reassuring him he can afford them, lol)

Akashi wears a two-piece silk pajama set to bed. Kagami teases him relentlessly for this

In retaliation sometimes Akashi 'forgets' to pack part of the set and steals Kagami's clothes (Kagami does not mind this in the slightest)

Akashi LOVES holding hands with Kagami and will do so anytime he can, even in public

Kagami gets easily embarrassed with PDA but gets (slightly) better at handling it as their relationship continues; if he's in front of the GOM he's less prone to getting flustered but in front of anyone else is guaranteed to make him go beet red

Despite this, he quite adores physical affection (when in private) and indulges Akashi whenever he wants cuddles etc and initiates a lot of their physical touch, be it hugs from behind, kisses on the neck, etc

Akashi is very much the little spoon and prefers laying on Kagami's chest or being spooned from behind

In terms of emotional sensitivity Kagami…isn't the best, per se, especially during the beginning of their relationship; while he's definitely not as oblivious as people often say he is he's still not quite in-tune when it comes to Akashi's emotions--though this is also due in part to Akashi not being very expressive when it comes to his more intense emotions and having the general tendency to bottle up emotions as a by-product of his upbringing; however, he slowly starts to let down his walls and is more vocal about any issues he has with Kagami/their relationship

When it comes to physical affection Bokushi normally doesn't initiate so Kagami is typically the one to initiate most contact when he fronts; however, he melts into it much faster than Oreshi does on most occasions, and though doesn't say so out loud very much appreciates Kagami's touches as they're one of the things that helps ground him

The main reason that drew Kagami to Akashi was how genuine he was and how easily Akashi was able to just be himself around Kagami without fear of judgement, especially when it came to his shortcomings

Kagami finds Akashi's tenacity in life and willingness to change and better himself extremely admirable and is something he looks up to a lot, and that despite this he's still so willing to be vunerable around Kagami and that he trusts him enough to let down his walls and get to experience life without the constant threat of perfection on his shoulders

Kagami always ends up bending down slightly to properly kiss Akashi, but sometimes he'll make Akashi stand on his toes to reach him because he thinks its cute (he does this most often with Bokushi, because he thinks he looks cute mad -> Bokushi then proceeds to yank his collar to bring him down to his height)

Speaking of height differences, considering Kagami's height he's very used to putting things on the top shelves so 9/10 Akashi has to stand on his toes to reach things in the apartment; to combat this, as a gag gift Kagami bought him a stepping stool to use instead. Akashi was Not Amused™ (he does still use it. very reluctantly might he add)

Bokushi was the one to first acknowledge their feelings towards Kagami (though it can be said Oreshi was just in denial as well)

Kagami tries his best to understand Akashi's condition and accommodate him as best as he can; he's gotten good at recognizing Akashi's triggers and can generally tell who is fronting when

One of their first major fights was involving Bokushi; before Bokushi allowed himself to actually act on his mutual feelings towards Kagami he would avoid him like the plague (short, curt responses to texts, ignoring calls altogether, not actively engaging in physical moments, etc), until eventually Kagami had enough and confronted him about it; this resulted in their first official 'break' of which both parties were obviously quite devastated at; thankfully, they were able to resolve this after some not-so-subtle mediation from Kuroko

Kagami's name for Akashi in his contacts used to just be a pair of scissors until Akashi found out and forced him to change it from sheer mortification

Kagami (most of the time) isn't really bothered about the Scissors Incident™ all that much and generally considers it water under the bridge, going so far as to make small jokes about it; Akashi, however, is still utterly mortified at the incident and refuses to speak about it and gets quite upset whenever Kagami makes jokes about it