Not bad, while I'm more for the fetish side of things, this was still a pretty funny story. Kinda like those more humorous doujins where the characters seem to be aware their in a more perverted situation.
I was gonna say, this certainly couldn't fit into the continuity of the first three, but still a nice addition to the Code Lyoko stories.
By the way, William can talk. He's actually gotten a bit chatty as season 4 has gone on, but it's that weird distorted voice like someone possessed when he talks, and it's assumed to be nothing but XANA doing the talking with no hint of William's personality at all.
Author's Response: Thanks, I'm glad you liked it ^_^
From the other two sites I've posted this on both replies I've gotten ask when a sequal will be made, since people want it, I may do a part two, staring Yumi and Aelita having fun in Lyoko. It'd most likly lack a plot like this one though if I got around to doing it.