Lucys Birthday.
If you are following the plot, and not just jerking off, in the Basement 6 Stephany, Olivia and Camilla were captured by Tasha, Nathan and their's gang. In the Basement 7 Olivia has returned to the freedom and others becomes slaves of Lucy, Tasha and others. So, they will be used in this story.
UPD. User trash mentioned that there was a few pages missed. So I checked and found missing pages.