Some more requested headcanons! :)

o    Daishou has two pet snakes and, every time he's over, Terushima wants to feed them, pet them and take photos of them to post on his social media. Once, Daishou got so jealous, he insisted that Terushima wasn't allowed to go near his snakes until they went out on a date and Daishou got at least twenty kisses. (The snakes' names are Emerarudo, which is Japanese for emerald, and Kane, which is Japanese for gold.)

o    Terushima often made trips to Tokyo, so he could visit Daishou, in secret before telling his parent he had a boyfriend - this was because he didn't want them to know Daishou was older than him, because they were originally rather close-minded.

o    Kuroo actually found out Daishou had a boyfriend before Nohebi did because they were bickering (their teams had long since gotten bored) then Terushima ran over and hugged Daishou, kissing him on the cheek and shooting Kuroo a mean glare - he had misread the situation and thought Kuroo was hitting on Daishou. It was a very awkward conversation, and Daishou made Kuroo promise not to tell anyone, since - at the time - he wasn't sure whether he was gay or bisexual, and he wanted to figure it out before telling his team. Kuroo, because he's a half-decent human being, complied.

o    They definitely met online, either with Terushima messaging Daishou to ask about his pet snakes or Terushima accidentally liking a two-year-old post while secretly stalking Daishou's' profile so Daishou messaged him to ask what the hell he was doing.

o    Both of them are huge reptile fans and they love going to zoos in Tokyo for dates.

o    Johzenji found out that Terushima was dating someone because they (accidentally) tried to set him up with a girl who quite liked him. However, when she confessed, he told her that he had a boyfriend. Johzenji, who was watching from the wings, felt really guilty for hyping the girl up but also very betrayed because Terushima never told them.

o    Nohebi found out about Daishou dating Terushima because Numai was just checking his notifications and then saw a picture of Daishou kissing Terushima on the cheek. He ran into practise the next day to confront Daishou about it, who was then forced to call his boyfriend, in the middle of practice, just so Nohebi could talk to him.

o    Terushima loves to do healthy 'boyfriend' challenges. (I've written a oneshot about this, in case you haven't seen it.)

o    Daishou pretends publically that he doesn't want Terushima's' affection but he actually gets super jealous and pouty if Terushima ignores him - Terushima loves taking advantage of this.

o    Daishou is always cold and Terushima is always warm, so Daishou has decided that he gets to take all of Terushima's' hoodies and then has the audacity to use him as a human radiator while wearing the stolen hoodies.

o    They will both take shit about Kuroo, even if Terushima's never met him properly before.

There will have to be a part two of this because I ran out of time to write! Sorry about that.