robomito, hozuki kaede, murosaki miyo, oyama mahiro, onii-chan wa oshimai!, commentary request, highres, 3girls, :d, ahoge, armpits, arms behind head, arms up, bare arms, bare legs, bare shoulders, barefoot, bikini, blue hair, breasts, brown eyes, chair, closed eyes, earrings, ferris wheel, frilled bikini, frills, hoop earrings, jewelry, large breasts, light blush, long hair, lounge chair, low twintails, medium breasts, multicolored hair, multiple girls, navel, o-ring bikini bottom, open mouth, palm tree, pendant, pink bikini, pink hair, reclining, red hair, small breasts, smile, stomach, swimsuit, tree, twintails, two-tone hair, water, waterpark, white bikini, yellow bikini