Lately, I've had some trouble understanding how to attach tails to fat asses. The way I see it, tails are attached to the spine, and seem to emerge at the bottom of the tailbone, or at the top of the buttcrack. And I'm not really sure how to add a tail to a fat person's posterior, like how to mold the fat around the tail, or even add fat to the tail. Sure, some tails seem to be more inclined towards fatness, but cat tails don't seem that way.
Do any of you guys have any advice or pointers of some sort?