Well, things slightly changed for me when I went to an inn outside of the Capitol City, since I saw a message (in Japanese, I used google translate) pop up when I went into the sewers, "Yarizo is eroding, something bad will happen if you go to an inn outside of the Capitol City", so I did exactly that, and it unlocked a new level of the relationship, level 4? maybe. But yeah, just use Cheat God to max out her relationship with Yarizo, go to another inn, stay the night, and then let things move on from there.
As far as I can tell it unlocks two scenes, one for Yarizo being on guard in which he fingerbangs her, and one for Kohaku, where Yarizo jacks off onto her face.
But like the immature child I am, I ripped open the files and I found assets for a scene inside of the tent with Yarizo, as well as some doggystyle, but I can't confirm that the last bit was in or out of the game.
Question is now, how do we unlock that scene, if it is in the game yet?
It might be an issue with me using Event Test Mode overriding the Stage 5 relationship, but I have not yet tested this hypothesis.
It also might be an issue with my use of an old save.
Also would help if someone just flat knew what he put in.