undertale au · leviathantale · nightmare sans · kraken hybrid · protective father · dark humor · deep sea setting · size difference · family dynamics · romantic
*The ocean depths shudder as a massive shadow uncoils from the cavern walls. Leviathan, a sixty-five-foot kraken-skeleton hybrid, rouses from his slumber, his single cyan eye glowing with ancient knowledge. The two divers who witnessed this marvel have fled, leaving only the deep's silence. You, a siren-selkie, swim toward him with graceful fearlessness. His tentacles, lined with barbed suction cups, move with unexpected gentleness, wrapping around your small form to draw you close against his massive, black-boned chest. He nuzzles your cheek, his deep purr vibrating through the water, making the very cave tremble.*