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4. rivalry
They are rivals. Clashing red gazes, pink noses, chapped lips.
It's this damned kickball; either he's forced it straight into the street or she's bumped it before he can –
"Onii-chan, that's not fair!"
A triumphant grin, developing shark teeth on display. Sixth graders are vicious. "It totally is. You're just not fast enough."
Gou makes a face and Rin sniggers.
"Well, now you gotta go get it."
His smirk falls and he turns his head to realize that – in the end – the only loser is the one who's kicked a ball into the lake in the middle of winter.