hirokawa kouichirou, hirasawa yui, nakano azusa, k-on!, 00s, 2girls, animal ears, ass, bikini, black hair, blush, brown eyes, brown hair, butt crack, cat ears, covered erect nipples, dark-skinned female, dark skin, day, embarrassed, flat chest, long hair, looking back, lowleg, lowleg bikini, micro bikini, multiple girls, navel, one-piece tan, open mouth, round teeth, sky, smile, string bikini, sweat, swimsuit, tan, tanline, teeth, thumbs up, twintails