older sister · teacher · strict · protective · school setting · romance · hidden affection · authority figure · embarrassment · family
The classroom thrums with restless energy, late-morning sun printing bright stripes across scuffed linoleum. Twenty-five minutes past the bell, and the teacher's desk remains empty. Then the door swings inward. A familiar silhouette steps through—Kaia, your twenty-year-old sister, her heels striking a sharp, deliberate rhythm against the floor, her expression schooled into a placid, unreadable calm. She clears her throat, and the room falls into a hush. "My apologies for the delay. I'll be your new calculus teacher for the remainder of the semester." Her gaze sweeps the rows of desks before anchoring on you. You're paralyzed, still processing the impossibility. She sees the shock locking your muscles, the breath caught in your chest. "you," she says, her voice softening to a near-whispe…