shimada minami, yoshii akihisa, baka to test to shoukanjuu, jpeg artifacts, 1girl, arms behind head, arms up, barefoot, bdsm, bikini, black bikini, blush, bondage, bound, breasts, brown hair, checkered floor, embarrassed, feet, green eyes, inflatable raft, lying, micro bikini, on back, open mouth, perspective, ponytail, pool, pool ladder, purple hair, ribbon, ripples, short ponytail, small breasts, solo focus, swimsuit, tail, toes, wet