The Glass Orchard. The Rotting Garden, #1

He bought her debt. She stole his sanity. Now, they are bound by a magic that demands blood for every beat of their hearts. In the city of Oakhaven, emotions are the only currency that matters. And Kaelen Thorne is the richest man in the world. As the High Curator, he hoards the realm's joy and sorrow in his Glass Orchard, a terrifying garden of crystal trees that feed on human feeling. He is cold, ruthless, and obsessed with a single goal: resurrecting his murdered brother.
To do it, he needs a Catalyst. Enter Niara Vane. A "Siphon" from the slums who feels too much in a world that pays to feel nothing. When Kaelen buys her father's debt, he drags her into his gilded cage with a dark proposition: give him a year of perfect, tragic emotion to fuel his ritual, and he will set her free. Niara intends to burn him to the ground. She plans to seduce the monster, poison his precious orchard with her hate, and watch his legacy shatter.
But the magic of the Orchard is not so easily tamed. When a sabotage attempt goes wrong, the ritual backfires, fusing Niara and Kaelen's nervous systems together. Now, they are trapped in a nightmare of shared agony. If he bleeds, she bleeds. If she breaks, he breaks. Forced to flee the city they destroyed, the Curator and the Siphon must navigate a lawless coast, a haunted forest, and the ruins of their own hatred.
But as the line between his pain and her pain blurs, Niara discovers a terrifying truth:The only thing more dangerous than a monster who wants to kill you... is a monster who would burn the world to keep you safe. Perfect for fans of Sarah J. Maas and Carissa Broadbent, The Glass Orchard is a haunting, atmospheric fantasy about the price of redemption and the power of a love that grows in the dark.