Hmm. Tough questions. I would venture to say that pre-slash is fine; what I mean by no chan is that I don't want to see 12 year olds (or younger) getting it on with other 12 year olds, OR with adults. Not something I am into. I don't rec stories like that, and I usually don't read them, unless I am surprised by it halfway through. It's a personal choice. I know there are lots of people who dig chan.

As to the ship question, if it's H/D, link me, even if the ship is not the point. A lot of the fics on this list have bigger issues going on than the H/D ship