1girl, arm_support, bare_arms, bathroom, black_hair, black_one-piece_swimsuit, blush, collarbone, grey_eyes, looking_at_viewer, matsunaga_kouyou, new_school_swimsuit, one-piece_swimsuit, original, parted_lips, school_swimsuit, short_hair, sidelocks, solo, steam, straddling, swimsuit, tile_wall, tiles, wet