Fake Earl: Leading the Dragon into the House

An illegitimate son of an earl who grew up in the mountains was accidentally involved in the inheritance dispute in the territory due to the death of the old earl. Dissatisfied with the strength of the new earl, the vassals tried to find a country bumpkin illegitimate son who could be more easily manipulated to participate in the succession. Unexpectedly, what they found was not an illegitimate son but a genuine black dragon. What does it mean that the vassal wants to support me as a puppet to deal with the new earl? You are big enough for me to eat a few meals, but you dare to talk to me like this. Why do you mean that the little property they gave me will be ruined by me sooner or later? Having dragon disease does not mean that dragons will not invest. What do you mean that those who are in high positions here only play tricks and assassinations? The assassin should first resist my attack and take a deep breath before making any moves. Western fantasy theme, middle-age low-level demons, farming style, non-human protagonist