I Can Only Blame Myself

I was really going along great on that Merlin fic that's been sitting around for close to 2 years. I even plotted up the villain's comeuppance. Then I get a stupid crossover idea in my head. Shawn Spencer meets Neal Caffrey when they're both 18. He'll meet Peter later and then there will be a reunion as the White Collar crew meet the Santa Barbara Police Department.

Why? Why? Why?