I think this is a genius idea. As a huge fan of the base game, and not a fan of NTR, I will not play this side story. But the concept is great. As many have said in here, putting the NTR separate from the main game gives fans that want it a chance to enjoy, and and fans that don't want NTR can completely ignore it. Not just skipping it like in most games, ignore it like it never happens.
Other dev's who don't know how to deal with the constant fight between having it in or not should take notes. I think this should start a trend for all developers.