Author's note: this is an AU where Tousen is a psych doctor, and young Aizen suffers from a split personality. The one that is normally out is very sweet and gentle. The other is psychotic, methodical and wants to take over the world.
When they had first met, Sousuke had been taken there by the two very nice policewomen, who had helped him clean off the very scary blood that the ten year old had found on his clothes and body. His momma and papa were in a safe place, very far away. Or that is what the genius child had been told. He knew that it likely mean that… He had hurt them.
Or that his parents didn't want an abnormal child like him anymore.
But Tousen-call-me-Kaname-sensei was very nice. He was gentle and he kept the ghosts from bothering the child, when he was near. Sousuke liked that, because if the ghosts stayed around for too long, he would come to command them, and then Sousuke would lose someone else he liked.
He didn't want Kaname-sensei to be the ninth person he lost to him.