mizukoshi (marumi), original, highres, 2girls, bare shoulders, beach, bikini, blue one-piece swimsuit, blue sky, blush, breasts, brown eyes, brown hair, cleavage, closed mouth, collarbone, covered navel, large breasts, long hair, looking at viewer, multiple girls, navel, one-piece swimsuit, open mouth, outdoors, school swimsuit, short hair, siblings, sisters, sky, small breasts, smile, stomach, swimsuit, water, white bikini, yellow eyes