This is a bit boggling. It's also really funny, in a sort of messed up way, and she is definitely giggling a bit at the two of them. Gene is essentially saying that he's whipped.

"I guess that's one way to try to keep each other out of trouble," she admits. It wouldn't have been her first strategy to reform Gene, but if it works then it works. "Um. That would be... Nice, I guess? I'm probably gonna need to borrow a toothbrush."

And everything else, basically.