Anyone remember this story

I think it was a series, about a couple whose house gets invaded by a few women who tie them up in their underwear and then tickle the husband until he says HEHEHEHEHEHEHEH HER FEET and then the wife says AAHAHAHAHAHAHAHAAAA HIS KNEES! Basically the husband and wife decide where the latter is being tickled next. I found it fascinating and used that game in one of my stories, but I can't think of what the source was.

Clean_kitchen is the author

here are all three parts
http://www.ticklingforum.com/showthread.php?t=52944 part 1

http://www.ticklingforum.com/showthread.php?t=57216 part 2

http://www.ticklingforum.com/showthread.php?t=68432 part 3

all the parts are good!!