Prosecutors said Goudeau warned the women not to look at his face during the assault .
The victims said Goudeau sexually assaulted the younger sister as he pointed his gun at the other sister 's pregnant abdomen .
Prosecutors said Goudeau warned the women not to look at Goudeau 's face during the assault .
The victims said Goudeau sexually assaulted the younger sister as he pointed his gun at the other sister 's pregnant abdomen .