1girl, black_eyes, black_hair, blush, bra, breasts, looking_at_viewer, lying, matsunaga_kouyou, medium_hair, navel, on_back, open_clothes, open_shirt, original, panties, polka_dot, polka_dot_bra, polka_dot_panties, shirt, small_breasts, solo, underwear, unworn_clothes, white_bra, white_shirt