1girl, a_tea, ahoge, arknights, arms_behind_back, bikini, bound, bound_arms, breasts, chinese_text, full_body, goggles, goggles_around_neck, la_pluma_(arknights), la_pluma_(summer_flowers)_(arknights), looking_at_viewer, looking_back, monochrome, navel, official_alternate_costume, one_eye_closed, rope, sandals, shibari, short_hair, sitting, solo, struggling, swimsuit, thigh_strap, whistle