What kinds of things do you feel comfortable or uncomfortable saying?
I’m a big fan of being on the receiving end, but sometimes I get a little uncomfortable. I had a partner who I know started believing what he was saying near the end of the relationship, and blurring those boundaries really messed with my head.
I’m a big fan of being told that I’m not intelligent - “dumb slut” etc - because I know that I am actually smarter than most of my sexual partners IRL but like to be a brainless fuck toy during the act.

I enjoy it, but only after making it clear beforehand that nothing I’m about to say is true/real and that we can stop at any time if she wants. I want people I have sex with to feel comfortable and safe.
As for what I’ll actually say, the usual degradation stuff like
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calling her a cheap whore that should stop thinking and just suck cock. And that if she ever has any delusions about being anything more than a useless dumb slut, I will fuck it out of her and make her apologise :)