1. You can be honest with her about how she looks (even though 9 times out of 10 she looks stunning).
2. You can tell her to do some things that are sort of strange and she does them because she trusts you. The end result of the strange poses are usually worth the discomfort.
3. She is comfortable around you so it's easy for her to loosen up, so you can get those perfect shots of her laughing. Especially if you bring up that thing that happened that one time.
4. It's a lovely moment you guys get to share. Nothing feels better than taking some amazing shots of your gorgeous friend.
Shooting with your best friend is an absolutely wonderful experience. This session I did with my best gal pal was not only easy, but fun. It allowed me to step back and admire her outer and inner beauty.