"There were times where Caroline and Justine asked to be shown around the human world too. They could be a real handful to put it mildly."

The thought of the memory of the time they forced him to do the Big Bang Burger Challenge, and he almost fell into a coma over it, makes his stomach hurt. Also the pain of when they tried to push him past his physical limits a couple times too comes to mind.

Ren has been told that every Wildcard has a different Velvet Room that reflects their world view, so it makes sense in a way.