kadoi aya, 2girls, :d, :o, ball, beachball, bikini, black bikini, black eyes, black hair, blue background, blush, collarbone, cowboy shot, cross-laced clothes, diving mask, frilled bikini, frills, goggles, gradient background, hair ribbon, holding, holding ball, innertube, lace, locked arms, looking at viewer, multiple girls, navel, open mouth, ribbon, short hair, side-tie bikini bottom, simple background, smile, spaghetti strap, swim ring, swimsuit, thigh gap, transparent, white ribbon