The tunnel nexus Your Own Shrinkray Adventure chapter 13 by dellobenedetto

You found yourself in a rather plain chamber, a chamber that felt both organic yet not, with 3 tunnels branching off of it—one that sloped downwards, one upwards, and one that seemed to be relatively level. You could see some more doors ahead that looked like the one you entered, and you had a feeling they led to more organs of this Indian girl. Though which path would you go down? You had a rough idea where they might be going, but there might be some surprises in store...

...And that's not to mention the possibility that the girl was more alerted by you entering that doorway than entering her ass. That could spell trouble... As could that of you not being alone in these tunnels.