2girls, age_difference, ahoge, alternate_breast_size, alternate_costume, amogan, arms_under_breasts, bare_shoulders, bikini, black_bikini, black_choker, blonde_hair, blue_sky, blush, bocchi_the_rock!, breast_conscious, breast_envy, breast_hold, breasts, choker, cloud, covering_breasts, covering_privates, crossed_arms, day, flat_chest, flying_sweatdrops, halterneck, ijichi_nijika, ijichi_seika, large_breasts, light_frown, looking_at_viewer, looking_to_the_side, multiple_girls, navel, siblings, side_ponytail, sideboob, sidelocks, sisters, sky, standing, stomach, sweatdrop, swimsuit, white_bikini