OfficeMate by Katie Ashley
This is a great romance novel. Thorn and Isabel are not meant to be in the beginning. Actually there is antagonism (a lot) but it is only to hide their attraction to each other.
They challenge each other all the time and it is so good to read the development of this enemy to lovers story and how they begin to show how much love is hidden by the anger.
I can say that it is one of the best books written by Katie Ashley and it is worth to read it!