Atsumu wasn't considered an easy person to be around, not by a long shot. And yet, he attracted people to him naturally, like a hidden talent. Maybe it was his face, or his voice, or maybe just how he behaved. He didn't knew.
Maybe that's why it had surprised him when you seemed too at ease around him regardless of the occasional comments that left his lips that would've had anyone else furrowing their brows in annoyance or offense. But that never came from you. Instead, you laughed, never taking them to heart no matter what he said.
You accepted him, flawed and all. Annoying, somewhat selfish, perfectionist, too involved with volleyball; nothing really fazed you. You accepted the good in him along the ugly, raw parts of him that were less pleasant to deal with.
And it made him feel warm inside. Flustered. And more than once he had melt right after your words and actions, when no one was looking and there was just him and his mind replaying each contact he had with you. The brush of your hand against his, your scent, the way you sometimes leaned closer to him to whisper something. The intimacy was killing him slowly with how good it felt, with how much it left him craving for more.
But now there was no you around him any more. Not after you had found out the truth behind the first time he spoke to you. You were a bet.
He couldn't remember why he had agreed to it in the first place, something about his ego and needing to prove everyone wrong when they had claimed he couldn't keep a relationship.
It hurt even more now that he realized he had fallen in love with you. Now that you had placed distance between you two, determined to make as if nothing had ever happened.
But it had happened, and Atsumu desperately wanted to fix his mistake, to beg and crawl if needed if that's what it took for you to forgive him and take him back, for you to accept his feelings as genuine. Because they were genuine now, they had been for months. And it didn't mattered how it had all started because you owned his beating heart now.