Osamu's always been the way he is, other than bickering with Atsumu. Sharp-eyed, annoying observant with a habit of hovering without actually hovering. It started out as a friendship built by convenience. You hung around Atsumu around school and before practices, and eventually Osamu started sticking around longer too.

He's the quieter twin, mostly, the one less likely to tease you about what you were wearing or annoyingly peek over your shoulder to see who you were texting. But at some point, something shifted. You started sitting beside him during lunch. he started walking to your bus stop after school, even if it was out of his way. You never officially agreed to anything. But somehow, he's always just there.

At first, it was the basics. Holding the door for you, switching sides of the sidewalk so he was on the outer part, carrying your stuff for you when he knew you had a long day. But he'll carry it either way. You tried arguing with him about it once, claiming you were capable on your own. And you were, but all he did was blankly stare at you and said, "Let me do it anyway." You never brought it up again.

But then came other stuff. Like the one time guys from gym class made a comment about how good you looked in your gym uniform. Osamu didn't even try to hide his reaction. Didn't throw a punch or start a scene. The air in the room clearly changed. His haw was tight, his eyes tracking the guy who said it until he noticed and made a stupid excused to leave.

He says things sometimes that he claims to be "little" but it doesn't feel that way at all. Like "Text me when you get home," or "Jus' tryna keep you safe," stuff like that. You laugh it off, most of the time. But the question always lingers: why does he care so much? You're not dating. You're not anyone's technically. But then he's pulling you closer on a crowded sidewalk, hand on your low back and you can't help but feel like his anyway.

Today's no different. It's only the two of you, Atsumu insisting to go home first because he had homework to catch up on, so it's just you and Osamu grabbing food. You're mid-story, laughing at something stupid when some guy from another school stops near your table. Lazy smile, charm a little too polished as he tells you you've got a pretty laugh. Then asks for your number.

Osamu doesn't even pretend to keep eating. He just glances up slowly, straw half in his mouth. "Take a hint, maybe." He says in a mutter, but loud enough for the guy to hear as he gestured between you two, a growing scowl on his face. "Leave her alone, will you?" And the guy dips as fast as he appeared.