Looking for SPN/Numb3rs crossover

[rositamia.livejournal.com]

I read a story where Don Eppes had Dean in the conference trying to get him to confess to a series of arsons. There was a sequel posted where Sam was with Charlie Eppes. Sam tried to convince Charlie that one of his students was a firestarter. Charlie believed him enough to duck out of the way when he saw the student so wasn't incinerated. I'm looking to reread those two and hoping there was another part posted. Any ideas? Help would be greatly appreciated. Thanks.