Dr. Frost by Haley Weir

Natasha Cable has lived a hard life, but she never let it hold her back. When she feels stuck in a toxic relationship, her saving grace comes in the form of her philosophy professor at Hearthfire University.

Natasha tries to resist the charismatic allure of Professor Frost, but there is something about him that she knows could ruin her.
Even despite the drama, she feels a deep, ancient connection towards him. Beyond the struggle, there’s an unbreakable bond she can’t ignore.
Professor Wyvern Frost has a dark secret. When his breeding cycle comes around, he can barely keep it hidden. Natasha Cable is under his skin, and her ignorant boyfriend flirts with danger each time Frost sees her in tears. He will fight for her. He will fight beside her. Will they rise above it all, even as new and old enemies plot against them?