Enjoying the demo. There's two things that would make this better, one of which it seems you're already about to do (allowing for a submissive route and letting them top).
The other would be, and I understand this would take more time to do but with AI art shouldn't be too lengthy, allow us a choice between being bigger than the girls or smaller - with emphasized dialogue based on that choice. Not enough games with that kind of customization and I'd definitely support such a project.