1girl, ass, back, ball, bare_shoulders, bikini, blush, bow, breasts, brown_eyes, clenched_teeth, cowboy_shot, exercise_ball, flat_ass, flipped_hair, from_behind, furrowed_brow, hair_bow, hair_ornament, halterneck, hand_on_own_elbow, light_brown_hair, long_hair, looking_at_viewer, looking_back, micro_bikini, parted_bangs, parted_lips, purple_bikini, red_bow, shirai_kuroko, shoulder_blades, side-tie_bikini_bottom, sideboob, simple_background, sitting, skindentation, sleepy_frippy, small_breasts, solo, sweatdrop, swimsuit, teeth, thighs, toaru_kagaku_no_railgun, toaru_majutsu_no_index, tsurime, twintails, wavy_hair, white_background