is it not possible to progress without letting nel rape the character, or is there just more grinding to do?
is there really no way to do the slab quest, except to give it to the fisherman?
I believe its because Nel, and many of the other characters you meet in the game are important to progress in the game, so there dont seem any other way.
The part of using the fisherman for the stone slab are acturly confusing at best, since you get told you have to talk to people about the stone, but what the game wants you to do is to use it for the fisherman´s chair, and thats really not helpfull without spamming any item you find in the game. More or less, the game gives bad hints sometimes for certan quest or romance