Because Ayo was abused he had all that built up anger burning and twisting inside him. And when he found a boy at about the same age as he was when he was abused, a subconscious mind kicked in saying :" why would I be the only one to be abused at this young age" and without knowing it, he became Uncle Ade himself.
Like seriously;
Abuse is a terrible thing and if proper care is not taken and the victims don't open up or receive proper treatment, they themselves may one day become the abusers.
Good one @tojukaka