2girls, o, ahoge, arms_up, banana_boat, bare_arms, bare_legs, barefoot, bikini, black_hair, blown_away, blue_bikini, blue_one-piece_swimsuit, blush, breasts, bright_pupils, brown_eyes, colored_inner_hair, covered_nipples, feet, foot_out_of_frame, fu-ta, grey_hair, groin, long_hair, midair, multicolored_hair, multiple_girls, name_tag, old_school_swimsuit, one-piece_swimsuit, onii-chan_wa_oshimai!, open_mouth, oyama_mahiro, oyama_mihari, pink_hair, purple_hair, school_swimsuit, screaming, scrunchie, siblings, sisters, small_breasts, solo_focus, spread_toes, swimsuit, toenails, toes, twintails, two-tone_hair, water, water_drop, water_gun, white_pupils, wrist_scrunchie