would you use my smut as proof of what doesn't work or stuff like that?

I wouldn't ever ask a friend to volunteer to be humiliated. If that were my plan, I'd use my own fic, or something pro. But don't feel pressured. If you don't like the idea, that's perfectly cool.

What I'm trying to write about is how characterisation comes across in fanfic so I need an example or two where the characters do work...then I'm going to change a couple of things to show how it wouldn't. But it'll be my version that sucks, not yours.

If you want to risk it you can see an advance copy, and if you don't like what I've done you can say no.