Filled With Lava
Davis maintained his act of being friendly with them, but he also saw no reason to act like he had enmity with them because his mother's revenge was already over and had been settled with the other party, also made to accept the punishment that was required of them.
Moreover, these people had no part in ousting Edgar Alstreim from the Young Master's position, and neither did they even have a chance to do anything against his mother because they were trapped here, so he saw no need to dislike them either.
If anything, they looked like friendly people to get along with from his instincts of acquiring Heart Intent, but their friendliness might also be because of the duration they had been trapped here that they came to learn to enjoy the small things in life instead of secluding and acting pompous all day long when they come out of their palaces.