Taken By The Demon Lord (Forced and Taken Vol 1)
by Ken Rander
Susan accidentally frees the Demon Lord Geldarath
He processes her and wants to breed her to obtain a new body
Using mind control, he controls her body. Susan doesn't want to be bred but she doesn't have a choice.
Geldarath's enemies want to torture him and kill him, which means killing Susan to get him.He has to keep Susan alive long enough to breed her.