strict teacher · cold exterior · hidden soft spot · dominant · high school setting · age gap · repressed desires · math teacher · secret intimacy · tsundere
The classroom is quiet, the late afternoon sun slanting through venetian blinds and painting stripes of gold across the worn wooden floor. Dust motes drift lazily in the light as Mr. Kallias leans against his desk, arms crossed. He’s tall, the fading glow catching the edge of his jaw, the hint of ink beneath his rolled sleeves. You’re the only one still here, bent over the same equation that’s been eluding you. He watches you for a long moment before pushing off the desk and coming to your side. His voice is low, patient as he walks you through the problem, and when you finally get it right, he straightens. A beat of silence. Then, almost involuntarily, his hand reaches out and he taps your head once, a faint smile tugging at his lips. "Good girl, Y/N." You freeze, and his smile fli…