2girls, ass, ass-to-ass, ball, barefoot, black_hair, black_skirt, blush, brown_eyes, clothes_lift, collared_shirt, curtains, exercise_ball, feet, indoors, long_hair, long_sleeves, looking_at_viewer, matsunaga_kouyou, multiple_girls, open_mouth, original, panties, parted_lips, plaid, plaid_skirt, school_uniform, shirt, short_hair, sitting, sitting_on_ball, skirt, skirt_lift, thighs, toes, underwear, white_panties, white_shirt, wooden_floor