1boy, 1girl, a tea, ahoge, arknights, arms behind back, bikini, bound, bound arms, chinese text, doctor (arknights), full body, goggles, goggles around neck, greyscale, helmet, hood, hoodie, la pluma (arknights), la pluma (summer flowers) (arknights), looking back, monochrome, navel, official alternate costume, rope, sandals, shibari, short hair, shorts, swimsuit, thigh strap, tying