The Doctor watched them with her best impression of innocence as they stripped down. Once the three of them were in the pool room, the TARDIS shut and locked all the doors leading out. They would not be allowed out until they were good and clean and the TARDIS had detailed all the mud they tracked in.
Jane did her best to protect Steve's modesty but she couldn't completely help it if she happened to enjoy stealing a good look every once in a while.
She didn't bother trying to get out of the pool until the doors opened, choosing to relax instead and float on the top of the water.
"I think the TARDIS just sent us to our room. And we didn't even get a water slide..."
The Doctor wasn't entirely clear how human parental punishment worked.