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The first thing you should know about Miya Atsumu is that he had often been told he was too much - that people got overwhelmed when in his presence for too long. So, eventually, he started protecting himself - he got used to having to hold back his true personality. He had to, if he wanted any of his relationships, romantic or otherwise, to be successful.
The second thing you should know about Atsumu is that when he’s alone, his thoughts sometimes manifest into words. Without him even realising it, he speaks his thoughts aloud as opposed to just thinking them.
The third thing you should know is that Atsumu and Kiyoomi had only been dating for a few months, when one morning, Atsumu unknowingly dropped his guard around his new boyfriend for the first time.
“Flavour is just our own saliva,” Atsumu thought aloud in a mumble.
Kiyoomi, with his breakfast halfway to his mouth, froze. Stomach churning as he processed the words that just came out of the blonde.
Atsumu noticed the abrupt halt in movement, and looked up to see Kiyoomi staring back at him.
“What’s up, Omi?”
“I’m sorry, but what?” Kiyoomi asked in disbelief.
All that Kiyoomi got in response was a, “huh?”
“What did you just say?” Kiyoomi inquired.
“I didn’t say nuthin,” Atsumu defended.
“Yes you did. Just now. You said something about saliva.”
Atsumu, affronted by how insistent Kiyoomi was being, furrowed his brow. “I was thinkin about how the enzymes in our saliva help to break down food, so basically when we eat food, we’re not tasting the actual food, we’re just tasting our own saliva.”
“I… I have no response to that,” Kiyoomi admitted.
The silence that hung in the air was enough to start Atsumu babbling. “But, I dunno what yer talkin about. Cuz unless ya can read minds and didn’t tell me —”
“— no, you definitely said part of it out loud,” Kiyoomi interjected before Atsumu got too far.
“I… really?”
“Yes!” Kiyoomi exclaimed, leaving the two men staring at each other. “Does that happen often?”
“I — I dunno. Maybe? But only when I’m alone?”
“So, what? You thought you were alone? Forgot I was here, did you?”
“No — no! Of course not! I think, maybe, I’m just as comfortable around ya as I am when there’s no one around.”
“Oh… either way… I’ve lost my appetite. I’m gonna go for a walk and have an existential crisis about how I’ve only ever tasted my own saliva.”
The dread immediately started to fill Atsumu, worry about exposing too much of himself setting in.
Before long, Atsumu heard the front door open again. He turned to see Kiyoomi stride right up to him and grab his cheeks. Palms squishing his face.
“You’re an idiot. You do realise that, right?” Kiyoomi asked, pecking his lips. Before Atsumu had a chance to answer, he confessed, “but I love you.”
Atsumu froze. His boyfriend had just said the three little words for the first time.
“I’m so happy you’re comfortable enough around me to be you,” Kiyoomi continued. “I don’t want anyone else… only you,” he said, placing his forehead to rest on his boyfriend’s.
“I love ya too… My Omi-Omi.”