2girls, ahoge, armpits, arms_up, barefoot, bikini, black_hair, blue_bikini, breasts, feet, grey_hair, holding_hands, interlocked_fingers, large_breasts, leg_up, long_hair, looking_at_viewer, multiple_girls, onii-chan_wa_oshimai!, open_mouth, oyama_mahiro, oyama_mihari, pillarboxed, purple_hair, school_swimsuit, siblings, sisters, small_breasts, standing, standing_on_one_leg, swimsuit, tilt-shift_(azalanz), twintails, two-tone_background, white_background, yellow_eyes