The Librarian and the Orc by Finley Fenn — book slip

Rosa Rolfe, a quiet librarian, finds her life turned upside down when a terrifying orc enters her library. Despite his intimidating presence, the orc offers her a scandalous deal: her books for her surrender. As Rosa grapples with her desires and fears, she is drawn into a dangerous bond that leads her to Orc Mountain, where she might be the key to preventing another war.

A dark, angsty, full-length fantasy romance. Can be read as a standalone.