1girl, d, ass, blonde_hair, blurry, blurry_background, competition_swimsuit, from_behind, huge_ass, indoors, kihou_no_gotoku_dmc, long_hair, looking_at_viewer, looking_back, low_twintails, one-piece_swimsuit, open_mouth, original, pool, red_eyes, sitting, smile, solo, swimsuit, twintails, water