1girl, arknights, arms behind back, ball gag, bdsm, black hairband, black panties, blush, bondage, border, bound, gag, gagged, grey background, grey hair, hairband, heavyrain (arknights), kneeling, long hair, looking at viewer, navel, no shoes, outside border, panties, pasties, purple eyes, qianshibu, solo, stomach, tail, thighhighs, thighs, underwear, very long hair, white border, white thighhighs