Garden of Silk

The power Slate Graystone needs to remain the ducal heir is just out of reach, and he’ll do anything to get it. Even become a demon. Battling new instincts, ravenous hunger, and struggling to find her place in a world that's much darker than expected, Slate—now Silk—will fight to claim the life she rightfully deserves. A life for her and the mundane folk she was sworn to protect. But when Silk learns that the corruption left in the fallen Empire’s wake runs far deeper than her own, she’ll need to choose: stand by noblesse oblige, or tear the whole system down—and the Sects with it. Also posted on Royal Road. — Description from novelcodex.org