There was no way for them to have known it. No way for them to have known that this place used to be the home of a mad scientist. No way for them to know that he still had active machines hidden in the house, and no way for the younger couple to have known what its function was once it was found and accidentally turned on.

Well, as the other couple seeing the house found out, it worked out very well for them. The husband was leaving just now, smiling at his wife who now had a sexy, fit male body below her. They didn't know it coming in, but this would be the best house tour they ever had!