The King (The Original Sinners #6) by Tiffany Reisz

Cunning. Sex. Pure nerve. Only this unholy threesome can raise him to his rightful place as a ruler of Manhattan's kink kingdom.

 Bouncing from bed to bed on the Upper East Side, Kingsley Edge is brilliant, beautiful and utterly debauched. No carnal act or chemical compound can relieve his self-destructive heartache—only Søren, the one person he loves without limit or regret. A man he can never have, but in whose hands Kingsley is reborn to attain even greater heights of sin.