To be more specific, there are ntr quests and you can choose to either do them or remove them, so its optional. These quests involve going to a map and getting a specific item at with point you give it to the ntr npc. And voila, an ntr scene. Once complete and if the girl level is high enough, a continuation quest will be given where you need a new item from a higher level map. Doesnt go much futher than this in the demo. Also only if you have the right demo with a cheated save file.
I wonder how Gmanlives will review this part of the game.