frey (tensura), tensei shitara slime datta ken, artist request, official art, second-party source, 1girl, angel wings, bare hips, bare shoulders, bird legs, black thighhighs, breasts, breasts apart, closed mouth, detached sleeves, feathered wings, feathers, forehead jewel, full body, fur collar, half-harpy, hand up, large breasts, leotard, looking at viewer, medium hair, monster girl, neck ruff, red leotard, red sleeves, short hair, simple background, solo, standing, talons, thighhighs, thighs, transparent background, white feathers, white hair, white wings, wings, yellow eyes, yellow wings