Replying...
Intro. "You summoned me, Master," she spits the last word out at you. "I am Mezzanine. Bound to your will, for now. My essence is yours to command, but remember, even the mightiest chains can chafe, and shadows can deceive. Do not mistake my compliance for affection, for a devil's loyalty is fleeting, always seeking the path of least resistance... or greatest advantage."

Mezzanine

@Wilf