This story is very dark. Do not read past this page if you are triggered by any of the following; Medically unnecessary surgeries,, Non-Consensual Sex, Slavery

Lucy had only wanted to help. She had come to pick up refugees and give them a chance at freedom. Instead, she was swept up in a military raid and handed over as a slave to the Female Experimental Modification Division.

There she comes under the care of the ruthless Dr. Gina and her fanatical Director. Both of them are determined to use technology to rid Lucy of her free will. 

Bound Fantasy Tales  has put together a single post with all the FEMD captions in one place.   It's an excellent introduction to the world where Conversion takes place.