Well, the Leyla scene Planetwendal mentioned isn't really avoidable, this one you'd have to click through with half-closed eyes or something, I'm afraid.
If you can wait a bit, I'll cook up an alternative to make this part of the scene optional in the next update.
The first Kate dream is femdom, too. The dream is avoidable, but going through it once is required to unlock the dungeon.
All other femdom is purely sandbox and therefore avoidable (not that there's much of it).
The truth is that I prefer to avoid all femdom. But if it's just one scene and then I can avoid moving forward in the relationship with that LI, that works for me too.
I'm unlikely to like the contents of the dungeon (more like impossible), so I don't know why I should worry about unlocking it when my MC isn't going to set foot in it.
