Haikyuu One-Shots and Head Cannons

Sakuatsu

Rivals. Thats the only word that came to peoples minds when they thought of Sakusa Kiyoomi and Miya Atsumu. Not the best word to have associated with them since they were on the same division 1 team. Ever since Sakusa joined the team its almost non stop arguing between the two of them. It was a common thing within their gym, their team outings, games. In fact there was not one time where any of the MSBY members, or anyone outside of the team, ever saw them have a peaceful conversation.  

However that started changing when the people in both Sakusa and Atsumu's lives ended up having odd encounters withe the pair. 

The first person to notice something off with the pair was none other than Atsumu's twin brother Osamu. Osamu and Atsumu knew everything about each other, they told each other everything (on their own terms of course). The Onigiri store owner noticed when he was taking food to surprise his brother that there was someone else at his apartment. This was extremely strange, especially considering Atsumu was having troubles keeping himself fed and healthy due to the fact he was struggling with a wrist injury he acquired in training. Whenever Atsumu gets injured he tends to get really down on himself and have anxiety attacks. 

Upon Osamu knocking on his brother's door it was opened by the person he least expected, Sakusa Kiyoomi. 

"Hello Miya, what brings you here?" Sakusa asks as if there is nothing at all weird about this situation to Osamu. 

"Uh, I brought Tsumu some food. I know how he tends to be when he has an injury and thought it would cheer him up." Osamu replied scratching the back of his neck.  

"That's very kind of you to do. It saves me from cooking." Sakusa said before they heard a voice from inside the apartment. 

"Omi-Omi, who's at the door?!" 

"Your brother brought you food Atsu, so get your ass out here and say thank you." Sakusa half yelled to Atsumu. Osamu definitely did not miss the nickname that Sakusa called his brother by, he was even more shocked to see Atsumu walk out in a number 15 MSBY jumper, looking like he was fresh out of the shower and that he was wearing no pants. 

"Thank you Samu! I knew you loved me!" Atsumu said to his brother happily before taking the food that Osamu had made for him. 

"Yeah, you know I love you, idiot. I wanted to make sure you're okay I know how you get when injured." 

"Thanks Samu, I really appreciate it. Also Omi knows about my anxiety issues and panic attacks. He's helped me a lot since I hurt myself." Osamu definitely didn't miss the small smile the graced Sakusa's lips or the way he looked at Atsumu. 

"Well, I better head back now. I have to clean up and it mine and Rin's date night." Osamu said before he heard his brother and Sakusa say bye as well before closing the door to the apartment. 

When Osamu recounted everything in his head he was so confused and had a million questions. The only reason he didn't voice his encounter to Suna was because he wasn't sure if Atsumu would have liked anyone knowing that Sakusa was at his place. 

The next people to have a strange encounter with the pair it was Hinata and Bokuto. It was after a later practice and both Hinata and Bokuto decided they'd walk to the corner store to grab snacks. They typically did that together but earlier than they did this night.  

"Hey Sho, is that Omi and Tsum-Tsum?" Bokuto asked looking to his junior counterpart who was just as shocked to see Sakusa and Atsumu together.

"Yeah, I think that is them. Do you think they came here together?"