This is a specific fetish that I've seen far too little of. I generally don't like plain incest, it just feels cheap and unnatural for people to decide to fuck their close relatives, but swapping bodies with their family and finding they have natural and uncontrollable feelings for them from the change just absolutely hits something hot that feels right. Just the right amount of strange taboo fantasy combined with the perfect excuse that their bodies are just doing what's normal to them, but in ways that allow the participants to have completely new and unusual feelings for each other that would be completely wrong yet which they can consummate without shame.
Base +8, Dr.Pervert +7, rockball +6, cukier12345678 +6