Red eyes stare down at them - nevermind that some of them are taller than him - unimpressed as always by what he sees. His eyebrows are already furrowed, and his mouth is curling downward, signs of his quickly receding patience, of which he does not possess much.
"What," he demands, never one to just ask things.
Uchiha Sayuri meets his unimpressed eyes with her own unflinching ones, mask firmly in place, emotions hidden behind a neutral expression - unless one is an Uchiha or thus versed in Uchiha-isms. If one were, they would note the miniscule arch of her brow and the stubborn edge to her jaw, the way she stands perfectly still and facing him fully, shoulders and feet and face. All markers blaring her own declaration, that she isn't afraid of him, that she thinks little of his opinion of her, and that she refuses to back down.
The same goes for speech.
What onlisteners hear is this: "Uchiha-sama, what a pleasant surprise! Now that I have been fortunate enough to bump into you, might I trouble you to aid me and offer some of your invaluable assistance to our young cousins?"
Polite, humble but not to the point of debasing herself, arrogant but just enough not to be unsightly, flattering, respectful, dutiful, and friendly - her words and demeanor encompass all of those things, to those who don't know any better.
What she means is this: "You're the Clan Head's son and heir, so why am I stuck tutoring these brats when it should be your job, oh great prodigious one? Get your head out of your ass and teach them something, damn it!"
Katsuki is an Uchiha. He grew up learning how to read his kin, just like her. He knows exactly what she meant. She knows he knows.
Which is why it is so infuriating when he ignores it completely and responds only to spoken words.
He snorts (Unseemly!) and tells her, "They've already got a teacher. Why the hell would I waste my time on them."
Why the hell should I! She wants to scream back, wants to scowl, but the Uchiha are in a bad enough position as it is. She can't go around ruining their image and making things worse by showing any reaction, especially a negative one, something she spends a frankly ridiculous amount of time admonishing her fellow clansmen for.
She's only ten years old. She shouldn't have to be the sensible one. She shouldn't have to go around nagging kids older than her, literal adults even, into behaving as their status dictates. They're still a noble clan. They're still a founding clan, and they have their pride. It won't be tarnished by unfounded rumors or gossiping civilians who haven't got anything better to do. There's no reason they shouldn't be able to keep their cool and work to find some way to get all the whispers and dirty looks and alienation to stop.
Katsuki narrows his eyes, and he must see some of what she's not saying, beyond even the non-verbal cues their Clan uses (and abuses, and it's just another thing to separate them from the rest of the village.) "...Fine. Fuck! But you're not getting out of this either, hairpin!"
Sayuri practically radiates smugness, enough that even a civilian might pick up on it, and for a long moment, she doesn't even care. "Thank you very much, Uchiha-sama!"
"Thank fuck!" She knows Katsuki hears.
She basks in her hardwon victory as the mob of Uchiha children swarm, and Katsuki's furrowed brow and scowl become even more pronounced.