natsu (norari kurari), hirasawa yui, nakano azusa, k-on!, 2girls, :d, animal ears, black eyes, black hair, black pantyhose, black socks, blush, bow, brown eyes, brown hair, cat ears, cat tail, closed eyes, hair bow, hair ornament, hairclip, happy birthday, heart, hug, hug from behind, kneehighs, kneeling, loafers, long hair, multiple girls, open mouth, pantyhose, round teeth, school uniform, shoes, short hair, sitting, skirt, smile, socks, tail, teeth, twintails