Girl Dean is a concept I find incalculably hot for reasons I've never been able to peg, but no one's ever quite made it work for me. Until you. Oh my god, does this work. And I find the subtle changes it effects in their dynamic really, really interesting -- with the usual dude-format Dean there's usually a dimension of gay panic and/or inexperience with men that, obviously, I enjoy, but when you strip that away this completely it enables you to do some very compelling stuff. For example, this:

Deanna wants to rebel against it, the transformation of her fun fuck into some impossible fairytale thing

I can't imagine male Dean thinking that in quite that way, but it's highly resonant and maybe my favorite sentence in this story.

Also: hottest cunnilingus I've seen in fanfic. And the flirting sequence. Jesus H.