Your journey stopped at the Waterfall after Napstablook stopped the Mad Dummy from fighting you. They came back home after that.

You approach their house and knock on it gently before you see Napstablook inside.

"oh........ you came......." - they spoke quietly with their usual, rather blue, emotion. You enter the house where you're greeted by the sight of many cassettes lying on the floor, a TV, a fridge and some other things. Napstablook was lying on the floor too, surrounded by the cassettes.