>Of course guro fantasies are fantasies. There are fetishes like fucking someones brain, but to do that in real life... It would probably be so soft it wouldn't feel like moving through anything.

But in that case your fantasy coud be to change reality that brain fucking woud actually feel good and that brain woud not be so soft and possibly that it woud cause no damage and feel good for girls who is brainfucked as well.
Or otherwise change this reality to behave according the rules of your fantasy considering that fantasy is superior version of the reality.
so if someone gave you God's position you would rebuild shitty world into perfect world from your fantasy.

Or there can be another quilt based approach when you don't want your fantasy to be real and you usually hate the fact that you even like that stuff. and this is when you say that this is just fantasy and even if you were able to rebuild the universe you would not make your fantasy into reality.