k-on!
akiyama mio, hirasawa yui, kotobuki tsumugi, tainaka ritsu
mizuki (mizuki ame)
4girls, ball, beachball, bikini, black bikini, breasts, day, grabbing, grabbing another's breast, groping, himejoshi, medium breasts, multiple girls, small breasts, surprised arms, swimsuit, yuri
bad id, bad pixiv id, photoshop (medium)