2girls, all_fours, black_hair, blue_skirt, blush, collared_shirt, grey_eyes, long_hair, looking_at_viewer, lying, matsunaga_kouyou, multiple_girls, on_back, open_mouth, original, overall_skirt, parted_lips, ponytail, school_uniform, shirt, short_hair, short_sleeves, skirt, tatami, teeth, upper_teeth_only, white_shirt, yuri