The Giantess Slave (Unabridged‪)‬

When Cindi and Nikki meet a mysterious woman at a late-night birthday party, they think she's just a friendly, eccentric bar-hopper. But when they wake up strapped to a table inside a warehouse, they learn she is so much more. 

Catherine is a scorned scientist who has developed a growth serum. She has implanted Cindi with a mind-control device, and once she gives her an injection, the girl starts to grow....

Now, Nikki must figure out how to rescue her friend before the giantess gets too big and brings the warehouse down on them both....

Contains: growing woman