izumi mahiru, akiyama mio, k-on!, 00s, 1girl, alternate costume, apron, ass, bass guitar, black hair, black thighhighs, blue eyes, blush, breasts, bursting breasts, cleavage, enmaided, female focus, frilled thighhighs, frills, guitar, instrument, leaning forward, long hair, maid, maid apron, maid headdress, panties, solo, striped clothes, striped panties, thighhighs, underwear, upskirt, very long hair, wedgie