...to cool down two POLAR bears.
Sooo NOT gonna work.
Just see Doc's ice bucket challenge.
The original idea for the gag was Miki saying something like she was going to 'dump a bucket of cold water on you two.'
To which Cara would reply something like "please, I just met him, we'll save that kinky stuff for later'.
In other words, implying that both of them would somehow find cold water kinky or arousing, etc. But I couldn't think of any dialogue that could accurately get that idea across.