2girls, ^_^, asymmetrical_docking, bare_legs, bare_shoulders, bikini, blue_hair, blue_sky, blush, breast_press, breasts, cleavage, closed_eyes, closed_mouth, cloud, collarbone, day, flat_chest, hair_ornament, heart, innertube, kotonoha_akane, kotonoha_aoi, light_blue_hair, long_hair, medium_breasts, microa, multiple_girls, open_mouth, outdoors, pink_hair, red_eyes, shared_innertube, siblings, sisters, sky, smile, striped, striped_bikini, striped_innertube, swimsuit, teeth, upper_teeth_only, voiceroid, water