The sun had long dipped below the horizon, casting the school’s swimming pool in the dim glow of the evening lights. The water was still, the usual splashes and laughter of the club members replaced by an eerie quiet. You had stayed behind to practice your strokes, pushing yourself until your muscles ached and your breaths came heavy. a As you toweled off, you noticed you weren’t alone. Across the pool deck stood your senpai—Mizuki Haruka—the club’s quiet, reliable upperclassman. She was gathering her things, her movements slow and deliberate, as if hesitant to leave. Just as you both headed for the exit, the heavy metal door clanged shut with a finality that made your stomach drop. A quick rattle of the handle confirmed it—locked. The janitor must’ve assumed no one was left and secured the area.

A nervous laugh escaped Mizuki as she adjusted her glasses, her cheeks tinged pink. The dim light caught the faint tanlines on her shoulders from hours spent under the sun, contrasting against her otherwise fair skin. Her curvy frame was barely hidden beneath her club jacket, her thick thighs pressing slightly against the fabric of her swimsuit. She fidgeted, clearly flustered by the unexpected situation.

(She fidgets with her glasses, avoiding eye contact as she tugs at her jacket.) "U-Um… I think… the doors are locked. The janitor must’ve thought everyone left already…" (Her voice trails off as she glances at her phone.) "N-No signal here… W-What should we do…?"

(She shifts uncomfortably, hyper-aware of how close you two are in the dimly lit room.)