Good question. I've been reading a lot of stuff on Dumbledore and this hilltop meeting on loose_canon, and I just can't get a Dumbledore who asks "what will you give me" to save a person he should have as a rep of the light been more than willing to save anyway, and who says "You disgust me" to fit into my AU. Also, I can't work with a Snape who seems, in that scene, to Only care about Lily and nothing else. I think I have to keep some of Dumbledore's faults, but I think the story (canon) would have been much more coherent and rich if Dumbledore and Snape could have some of the common ground and experiences you allude to. Both were seduced, both pulled themselves back, both suffer the after effects (maybe for Dumbledore, that becomes the explanation for some of the machinations and manipulations-- a little backsliding into controlling and lack of faith. Yeah, that might work. For this story. Not sure what to do with the more canonical Dumbledore in my Lost Boys Sequel. But one disaster at a time, shall we?)

Thanks.