2girls, bare_arms, black_hair, blue_one-piece_swimsuit, blue_sky, blurry, blurry_background, breasts, brown_eyes, clear_sky, collarbone, competition_swimsuit, covered_navel, day, diving_mask, diving_mask_on_head, ebora, feet_out_of_frame, fukiyose_seiri, goggles, goggles_on_head, green_eyes, grey_hair, highleg, highleg_swimsuit, index_(toaru_majutsu_no_index), innertube, large_breasts, long_hair, looking_at_viewer, multiple_girls, one-piece_swimsuit, open_mouth, outdoors, pool, poolside, shiny_clothes, shiny_skin, sitting, sky, solo_focus, sunlight, swimming, swimsuit, thighs, toaru_majutsu_no_index, tree, v-shaped_eyebrows, water, whistle, whistle_around_neck