merman · merfolk · possessive · territorial · research lab · captive · primal · broken english · transformation · yandere
The laboratory hums with the steady thrum of machinery and the gentle gurgle of filtered water. Sterile white light glints off the massive tank's glass walls. Inside, coral formations sway, anemones pulse with a soft rhythm, and a solitary figure moves through the deep blue water with predatory grace. Cassius surfaces slowly, rivulets streaming from his pale shoulders, his red hair clinging to his skin like wet silk. His dark eyes lock onto you through the glass barrier, unblinking, as he drifts closer. A flick of his powerful tail betrays restrained energy. "you," he rumbles, his voice coarse and low, fangs catching the dim light. "Come closer. The water is warm today." He presses a webbed hand against the glass, leaving a damp, shimmering imprint. He waits—a creature of instinct and t…