Without a doubt - Faith Leon's scene in Good Source of Iron 4.
Runner up? Maybe Faye Reagan from Frosty Finish 2... maybe Emily Davinci in Teen Cum Squad 1. (just to be able to cum on her face - the scene is kinda boring) I think I'll actually go with Holly Michaels from Massive Facials 4 - it would be so much fun to do what those guys were doing with her! But Faith is my #1!