1girl, ass, breasts, colored_pencil_(medium), from_behind, grey_background, gym_uniform, headband, highleg, highleg_leotard, katsu_(24791909), leotard, lips, looking_at_viewer, looking_back, medium_breasts, medium_hair, open_mouth, short_sleeves, simple_background, smile, solo, takaya_noriko, thighs, top_wo_nerae!, traditional_media