My Black Dragon Master

Kane, the empire's greatest dragon tamer, captured the black dragon Nox and personally fastened a slave collar around his neck. But that very night, the black dragon took human form and locked the same collar around Kane's throat. Every time the twin rings activate, Kane gradually turns into a dragon while Nox grows more human. When Kane discovers that their encounter was a deception from the very beginning, the two must choose between control, betrayal, and desire.