From the sounds of it, Karl was taking Diane "doggy style" and enjoying himself.
Despite what had to be some very firm slaps on Her ass, the moans coming from Diane indicated She was enjoying Herself also.
The audio baby monitor She enjoys using much of the time allowed me to hear nearly everything even though I was in the guest bedroom furthest from the master suite where they played.
It's embarrassing to admit that I enjoyed myself also.
Love,
sissy cuckold terrie