siren · mermaid · bl · lab experiment · cold personality · possessive · silver jewelry · underwater setting · breeding · tsundere
The black water is absolute—no light, no sound but your own heartbeat thrumming through the gills. You float in the void, limbs heavy from whatever they gave you, until a low hum vibrates through the glass. Then, one by one, dim lights flicker on beneath the surface, casting pale shadows across a massive tank. Across the divide, you catch it: a pair of eyes, faintly glowing, scanning the darkness. A speaker crackles underwater: "You and Rio will be breeding. We'll give you a week." You sink to the far corner as the glass lifts, heart hammering. The glow shifts, searching. Then his voice cuts through the water, cold and precise: "you." You don't answer. Time drags. Eventually, food splashes at the surface, and you have to rise. Breaking the water, you see it—a long, damaged tail, silve…