hirokawa kouichirou, tainaka ritsu, k-on!, 1girl, arched back, bent over, bikini, blush, breasts, brown hair, covered erect nipples, drawing on another's face, female focus, hairband, looking at viewer, lowleg, lowleg bikini, micro bikini, open mouth, outstretched arms, ribs, round teeth, shiny skin, short hair, skindentation, skinny, small breasts, solo, spread arms, standing, string bikini, swimsuit, teeth, towel, white bikini, yellow eyes