1boy, 1girl, a_tea, ahoge, arknights, arms_behind_back, bikini, bound, bound_arms, breasts, chinese_text, doctor_(arknights), goggles, goggles_around_neck, greyscale, helmet, hood, hoodie, la_pluma_(arknights), la_pluma_(summer_flowers)_(arknights), monochrome, navel, official_alternate_costume, rope, shibari, short_hair, shorts, swimsuit, thigh_strap, tying