Rust Moon Realm Book 1: A Dark Fantasy Erotica by Maeve Harlow
When Fiona falls through a portal into a violent and magical world, she is captured by a group of cruel soldiers who are tasked with breeding her, and hiding her from the Goddess of Wrath. Fiona’s mysterious new powers make her sought-after…and dangerous. An enchanted collar makes her to submit to the whims of the army’s mercurial commander as he and four soldiers travel through dangerous land by day and take turns bedding her each night.