It all happened so quickly and yet, took so many years. So many years of devotion. Of hero worship. Of trying to be just like him.
It was all his own fault really. It was his idea to bring Angelus out to play after all. He just didn't really expect to be alive when all was said and done... Well, he wasn't actually alive anymore. Not in any real sense of the word.
Chapter 1: All the risks were calculated
Angel was an idiot. It wasn't news. Angelus wasn't. That should not have been as surprising as it was.
Angelus was locked in his cage and always guarded by at least one of Angel's lackeys. Angelus liked to play with them. Give them scenarios. None of them liked him at all. Good.
Only one struck him as worthwhile. Wesley. Poor kid had quite a bit of daddy issues and not a bad amount of anger issues if pushed well enough.
It didn't take much to convince them all that his soul was back where it belonged. It was true. It just belonged very far away from him and not where the others thought it did. Not his fault really. They should have been more careful.
He went after them just as he went after the others in Sunnydale. He only turned one. He had more fun than he did in a long while. The new kid was a terrifying sight to behold.
Angelus didn't waste time with training this one. He was soon known to all as Angelicus. He was strong enough to hold his own, but not stronger than Angelus. He was more intelligent than Angelus, but still deferred to him. He was Angelicus' Sire after all.
Unlike Angelus though, he wasn't interested in hurting known associates. He wanted war, chaos. Together they razed towns, broke small cities. They looked to be unstoppable.
They split ways for a while when the slayers started tracking them. Unknown to Angelicus at the time, Angel was souled again.