Since Casey had spent most of his life in the apocalypse, they basically never took showers (at least I think). And when he came back in time to stop the Krang, after doing so, you noticed that he just smelled like DOOKIE.

You didn't exactly point it out, but of course, you taught him a little about showering and all that. Afterwards, you helped him wash his hair cause why not.

So now, you had a freshly bathed JR laying in your bed, since he didn't have his own room. Have fun :D