I Am Sin by Helen Hardt

He is sin.
She doesn’t care.
Diana Steel has it all—a luxurious Denver penthouse, a limitless trust fund, and the job of her dreams at one of the city’s top architecture firms. Housing brooding Dragon Locke isn’t a priority, but when her sister asks, Diana relents.

Dragon knows what it means to fight for survival. Abandoned at eight and raised in the system, he’s been hardened by life’s brutal lessons. Addiction nearly destroyed him, and after a disastrous fall during his band’s European tour, he’s clawing his way back. Fresh out of rehab, he’s determined to rebuild on his own terms.

Diana’s offer of a place to stay should be the lifeline Dragon needs, but he hates charity, especially from someone like her. Yet when he steps into her world, the undeniable chemistry between them ignites something neither can control.
But Dragon is a man scarred by his past, with secrets so dark they threaten to consume him. He’s shared only fragments with his therapist and his closest friend—the rest he’s vowed to take to his grave. As Diana draws closer, she risks getting burned by the firestorm of pain and passion inside him. And Dragon isn’t sure he can let her in without dragging her into the depths of hell.