all of a sudden , i willed my limbs to action , but before i could so much as move , she appeared again , above in the window , visible from the waist to the top of her bowed head , peering down at me , and with her hands she tore loose the low embroidered border of her gown and bared her naked white breasts before me - tiny , rounded , very close together and with piquant nipples visible only in their darkness .