Reap and Sow by Charlotte B. Plumb

The penniless in Blackbridge have only two choices: sell your body or sell your soul. And thanks to Eda Shaw, business is booming.

Indentured to a capricious demon known as Mr Night, Eda and her brothers arrange illicit Pacts on his behalf, luring the city’s most desperate into trading years of their lives for their deepest desires.

When a Pact goes awry and her brothers are arrested Eda quickly realises she’ll need an infernal ally of her own: Kit’rath, a demon with a curious penchant for humanity, and the only being in Blackbridge Mr Night seems to fear.

But Kit’s help doesn’t come cheap. Eda’s already given him her soul; she can’t afford to give him her heart.