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Atsumu had always been the one to make the first move, may it be through messages or asking Kyoomi out for dates. Kiyoomi got so accustomed to it that he panics when Atsumu doesn't message him for an entire day. He goes back to their messages and rereads them.
Everything's fine. Atsumu used emojis, sent him some memes and even some selfies. So, he evaluates his responses to make sure he didn't sound uninterested or check if he could've said something that might've offended Atsumu or put him in a bad mood. But in the end, he found nothing out of the usual.
"Stop overthinking it. He tells you things he doesn't like, so there's no need to panic," Kiyoomi whispers to himself, but he still finds himself pressing the call button.
Kiyoomi hears the ringing, and his heart immediately starts beating erratically.
What if he's busy? What if he finds it annoying? What if everything's fine and I look like I'm too clingy? What if he gets mad?
All these questions keep running in Kiyoomi's head, making it difficult to make the first move. He sighs as his thoughts get the better of him, but before he could even turn off the call, Atsumu's voice pulls him out of his head.
"Hey, Omi-kun! What's up?" Atsumu asks on the other side. Kiyoomi gulps and straightens his back as he tries to keep his composure.
"Nothing," Kiyoomi answers, there's silence on the other side of the line, and this makes Kiyoomi panic once again.
"Oh, then why'd you call?" Atsumu asks. His tone's normal, and yet Kiyoomi still feels like something's off.
"I just missed you," Kiyoomi whispers, it was so small that Atsumu almost didn't catch it, "I'm sorry for bothering you so late at night,"
"What? No, don't apologize! I like it, actually," Atsumu says, "it makes my heart really soft hearing you say you miss me,"
Kiyoomi can imagine Atsumu smiling on the other end of the line, and this made him feel silly for panicking over Atsumu not messaging him.
"So, what now?" Kiyoomi asks as he lays on his bed with a calmer heart and a smile on his face.
"I don't know, tell me about your day. I just slept the entire day, so I don't have much," Atsumu answers.
Kiyoomi smiles, "okay,"
Kiyoomi then proceeds to tell Atsumu about his day, and they ended up talking until past nine. Once Atsumu notices, he says, "Omi, we have to go to sleep. We still have Saturday training,"
"Oh," Kiyoomi says and turns to the clock, "I guess this is good night then,"
"Yeah," Atsumu says, "but before you hang up,"
"What is it?"
"I just wanted you to know that it made me really happy that you called," Atsumu says, making Kiyoomi grin wide, "Then I'll call you more often,"
Kiyoomi doesn't hear a response, but he does hear a muffled scream which makes him chuckle, "Okay, I'll call you tomorrow morning,"
"Okay, Omi-kun, good night. I love you," Atsumu says, making Kiyoomi's heart run wild.
"Good night, I love you too, Atsumu," Kiyoomi says and hangs up before turning on his side and sleeping with a smile on his face now that he knows that making the first move won't annoy Atsumu.