I'm not gonna give any instructions on how to use the .scene files since they're kinda buggy and not likely to work well anyways.

If you are gonna attempt to use them however, these are the names you'll need:

"Front" - Torso end poking out of the portal
"Ass" - Ass end poking out of the portal
"Giver" - The one giving attention to the ass
"Receiver" - The one receiving head.