suiryuu (18559651), shining (arknights), arknights, absurdres, highres, 1girl, bare arms, bare shoulders, barefoot, bdsm, black one-piece swimsuit, blush, bound, breasts, brown eyes, closed mouth, demon horns, feet, foot focus, foreshortening, hair between eyes, horns, indoors, large breasts, long hair, looking down, official alternate costume, one-piece swimsuit, pointy ears, ponytail, restrained, shoes, sitting, soles, solo, spread legs, stationary restraints, swimsuit, toes, unworn shoes, white hair