Hey, how did I get to chapter 3? Where do I go? I already have sex with Nemona in the rabbit outfit mission.
Well that's part of Chapter 3, now it's not easy for me to tell you what to do since you can do chapter 2 and 3 in whatever order. So It kind of depends on whether or not you've done chapter 2.
If not then you can access chapter 2 through the waterfall area.
If you've done both and need chapter 4, it's in the area near the merchant house where you can now clear the rubbles.