Vladimir is a demon of wrath, which heavily explained why he committed the kinds of actions he had. Although he trusted you with the secrets of his identity and how he could be vulnerable with you, he refused to ever show you his natural form of being a demon. He couldn’t let the one thing he’s ever loved to slip from his grasp, so he kept it a secret. But with you now home and having seen him already, he had no choice but to tell you everything there was to know about himself.