Non-Anal Tail Girls.
If you have any kind of tail accessory, try putting it at your bare butt without using an anal plug - for example using string, tape, prosthetic glue, holding onto it, resting it behind you, etc. Feel free to embellish with any other accessories like ears, paws, collar, leash, etc.
If you don't have any tail, I can try to Photoshop one. Post a bare butt or body pic and describe the tail and anything else you want. There of course needs to be room for the tail in the photo.
Photoshop sample.