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2girls arm_up armpits bare_shoulders bikini bikini_skirt black_hair blonde_hair breasts cleavage feet green_eyes hair_ornament hairclip inflatable_armbands innertube kaho_(koto-channel) knees_together_feet_apart koto-channel legs long_hair medium_breasts mihama_kosumi multiple_girls navel official_art one_eye_closed open_mouth purple_eyes sandals senji_(tegone_spike) side-tie_bikini smile surfboard swimsuit telescope toes