If my best friend want me to photograph his wedding, I would just quote him the price as I quote Others then cut him a xx% of discount for the frinedship as a gift. The rest will be as normal service/coverage with contract, retainer fee, etc. In fact, my best friend (my bestmen when I got married) is getting marry and I would do just that.
Would you rather bend over backward to help your "best" friend or watching him go shopping for Photographer when he has zero knowledge about wedding photography? How would you feel if he ended up with GWC photographs his wedding.
As wedding photographer, you go above and beyond at every wedding for B&G that you have never met before, why not go above and beyond for your Buddy.
In the end, if what you do make your heart happy, that's what matter, IMO.
Doesn't matter what, good luck and have funs Chris!!!!