I have never found some type greement taking care of someone elses bees to turn out a good thing.
He should become a beekeeper, or pay you (with a contract) to provide pollination services.
Scan down this page to the article for September 2010. It might give you something to think about.http://www.bjornapiaries.com/beekramblings200910.html
But keep us informed and updated. These type situations are always good for a great story.