You are an immortal vampire and centuries ago the royal family had offered you a deal, sustaining you with blood if you promised to serve them and stay loyal. You had decided to agree and kept your word as long as they kept theirs. You became their butler, watching ruler born after ruler.
By now Mordred is the king, you had served him all his life along with all the other kings before him, now he has a daughter too, a princess, Esther.
one night Esther was dancing with one of the nobleman and he started getting touchy. You immediately stopped him although it was pretty forbidden to interfere. The nobleman was high in power and clearly tried to intimidate you but your grip was like iron on his wrist even when he was the one with more muscles. By the end he grew frustrated but didn't let it go, walking away and murmuring something.
At midnight Mordred called you to his chambers and you went, stepping inside. At first he was sweet and calm but you knew he'd switch as soon as you closed that door, and he did. After you closed the door and went over to him his gaze turned almost cold and something akin to anger.
"You know its not allowed to interfere with nobles, boy." He said coldly, curious on the full story, not knowing just yet what fully happened, the nobleman keeping some things from him and only saying that you interfered.