That crawly feeling up Tony's spine (wasn't cockroaches) could have just been the environment itself (damp, dark, cold and thriving) or its effect on his perception. After all, he hadn't given Jess any reason to be without affect; he just couldn't properly see her face in this light, and the acoustics threw off her voice. They agreed.
"Good." That should have been jubilant, they agreed. What was happening here? That illustrative hand started to twitch between them, ready to ask that question, but concerned the answer was going to push back. Not that that had ever stopped him before. Tony cleared his throat before venturing, "You don't want it, do you?" It was a reasonable desire, Tony thought, but a dangerous one, particularly dangerous if a person was willing to go to lengths such as maybe wading around in sewage and hoping for the best.