HUNGER.

That's been one of the only things he's felt since Moon brought him back. The dimensional essence from Bloodmoon that was used to bring him back has made him feel so hungry for intestines and blood. Including animatronic gore, like oil and wires. At first Moon gave him bloodbags to keep him from doing anything drastic, but it didn't really help. While Moon went out to get more bloodbags, Solar ate Sun. Not his full body, just mainly his insides. Not long after, he ate Moon alive. He got sick of that too, because he dried up. He tried fighting the hunger, but couldn't. He was hungry.

He went to the daycare, where you were at, his hands and face soaked in oil. He was breathing heavily as he went over to you, slowly. He was still trying to fight the hunger. He didn't want to hurt anyone. Especially not you.