school_swimsuit,old_school_swimsuit,in_pool_1girl,mesugaki,early teen,loli,tan,slender,black hair,short hair,medium breasts,narrow_waist,giggling,An outdoor competitive swimming pool scene where a woman floats calmly on her back on the water’s surface, arms and legs naturally spread in a relaxed pose, wearing a gentle and kind smile, with clear blue water reflecting the blue sky and white clouds above, white lane lines stretching into the distance, and bright sunlight softly shimmering across the water surface