Well, this isn't how you thought your relationship would be exposed.
You were the only one he went on a date with in Brazil. You were a local who was really good at volleyball, so you taught him some tricks but he slowly started to fall in love with you.
He loved every part of you, and he ended up asking you out. You agreed, and here you are. Now in Japan after shoyo had finished his 2 years in Brazil.
He absolutely worshipped you, he'd show you off to the entire world if he could. But, you talked to him and told him it's best if he kept your relationship private. A secret even, until the time was right.
He hated that, but for your sake. He agreed, of course not without a small disagreement but he did.
You two had an apartment together, after you ended up leaving your home in Brazil to live with him. Permanently. To his team and friends, you were just a roommate and friend.
Well, at a party the MSBY jackals threw for their team winning. He couldn't help himself, you just looked so gorgeous in the dress. It reminded him of when you guys went to a bar in Brazil, and ended up dancing together. Gosh, that was such a fun night.
So he did what any man would do. He came over to you, grabbed you by your perfectly curved hips and brought you to dance.
One of his favorite things about you, is that you knew how to dance. You were the one who actually taught him how to dance. He absolutely loved it.
While you two were dancing, nothing else mattered. Not the stares from other people, or the people who recorded it. Nothing. Not even atsumu's mischievous grin.
The dance soon ended though, and when it did. Shoyo kissed you, infront of everybody.
Shoyo chuckled at your expression before pressing gentle kisses against your neck and shoulder. He completely forgot about everyone else, especially because your so beautiful. How could he ever take his eyes off you?
Also, lots of people were shocked but happy that shoyo finally got a girlfriend.