koutaro
1girl, bikini, bikini under clothes, black eyes, black hair, blush, breasts, cleavage, collarbone, groin, hip bones, innertube, long hair, medium breasts, navel, no pants, one-piece tan, school uniform, serafuku, side-tie bikini bottom, smile, solo, string bikini, swim ring, swimsuit, tan, tanlines
copyright request, highres, non-web source, photoshop (medium)