One eye is a different color from the other, usually drawn with bright, high-contrast irises that make the face look extra striking and a little supernatural. Panels often linger on close-ups of the eyes during flirting, shame, or orgasm faces while the rest of the scene gets filthy with fucking and cum. It also pops up as a character-design tell for “special” girls like demons, hybrids, or magically altered heroines.