1girl, ass, back, bed, bikini, black_hair, breasts, brown_eyes, cougar_(cougar1404), halterneck, hugging_object, k-on!, leaning_forward, long_hair, medium_breasts, nakano_azusa, on_bed, original, pillow, pillow_hug, solo, standing, striped, striped_bikini, swimsuit, twintails, vertical-striped_bikini, vertical_stripes, yellow_bikini