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Summary
“Shouldn't nii-san know better?” Yukio sighs. “You've had a tail for over five years. I'd say this is verging on shameful.”
Rin chokes on his own breath. “Oi…”
“Nii-san,” Yukio says, just to get under Rin's nerves. “It's very improper.” He sees a small blush crawl up Rin's cheeks. “It's impolite. It's exhibitionism.”
“Uh-huh,” Rin says, slightly dazed.
Yukio stares at Rin, at how red he's become, at how much he's squirming. A lightbulb goes off inside Yukio's head. “It's on purpose. You're… asking for it.”