1girl, all fours, arknights, ass, bangs, bare shoulders, black dress, bracelet, breasts, breasts out, covering, covering breasts, dress, from behind, grey hair, horns, jewelry, long hair, looking at viewer, looking back, mudrock (arknights), mudrock (obsidian) (arknights), no shoes, official alternate costume, open mouth, pelvic curtain, pointy ears, simple background, skindentation, sleeveless, sleeveless dress, soles, solo, thighhighs, very long hair, white background, white thighhighs, zerotwenty (020)