It's just like my slash fiction! ... Is it still slash if it's selfcest? These are the questions nobody should be asking.

I think everyone should ask them. ;)

Well Mike Finkelstein, you're wrong about that. You're so wrong that it's fractal, and describing all of the details about how you're wrong about that would therefore take an infinite amount of time. So, to avoid doing that I'll answer the question instead: Selfcest should be labeled as slash. How else would you distinguish it from stuff like the Sexy Losers original character Mike and how he loves himself with his left hand? Now, someone disagree with me so we can have a flame war about this. I say selfcest is slash, and everyone who disagrees is a dirty heretic who should die for the glory of the emperor!

I mostly agree, except when the original creator of whatever it is a slash of decides to incorporate it into the official sotryline. Then it stops being slash, but until it is made official of course it is slash, mostly because of trying to explain away the time travel/dimension hopping needed to enable it to happen.