Create an entirely new planet for yourself

Yeah... Yeah! That's gotta be the best idea you've ever had! If you really have an infinite tail, you could surely build a new planet out of it. A paradise planet, where catgirls and humans can live in peace, copulate and sire healthy offspring to outshine Earth in cultural achievements.

But how to do it all? The orbit is an awful ways from here. You retract your tail like the power cord of a vaccuum cleaner, leaving your living room in disarray, and run outside.

The sky is clear. Clear for taking, that is.

You coil up your tail into a masasive spring underneath you. With a bit of an added 'oomph' from your magic ears, you launch off into the sky like a tiger leaping gracefully towards its prey, or perhaps a stray piece of paper tumbling in the wind. Nevertheless, your inherent magicness ensures escape velocity is met, and your destination reached.

Up on Earth's orbit, you have no functional manner of breathing. This inconvenience is minor enough for a magical creature such as yourself to ignore, however. Similarly, the lack of oxygen doesn't seem to impede your ability to speak.

Sophie: "Now let's get this planet a-rolling!"

You spool out your tail at what you believe to be the maximum speed. In response to the staggering speed, your butt vibrates like some kind of a poorly affixed... industrial... machine, thing. You get the idea, not everything has to be a badly constructed simile. You experience supersonic butt wiggles.

In a matter of minutes you've accumulated an asteroid's worth of tail. Suffice to say it feels slightly offputting being attached to a body part literally hundreds of metric tons in weight. You can feel the flexible manifolds of your tail-asteroid rubbing against themselves.

Now your future planet has enough mass to attract small pieces of space junk and dust with its gravity.

Sophie: "This might be a good time to 'save'. Let's see if I can do this..."

You crouch down and pinch your tail near the base. It deforms into a paper-thin strip, before detaching from you entirely. You've now formed an asteroid of your own.

Sophie: "Wonderful!"

You unspool about a dozen more tailloads of similar size, incresing the overall mass by tenfold. Time for a looksee. Taking a small stroll to explore the edges of your expelled extremeties, you can't help but notice that this planet-in-progress is still quite barren.

Sophie: "Hm. I'm fairly sure that having only an infinite tail won't solve all of my problems. I'll need stuff like water, trees, animals and people to live here! Even dirt, that underfoot underdog of materials, would be really useful to have around."

While speaking, your ears begin to twitch by themselves, and to your surprise release a sparkly dose of wonder into the surrounding area. As the gleaming little droplets of potency gently surface on your tail asteroid, portions of it turn to rock, dirt and grass. Seems that terraforming will be a lot less complicated than you thought.

Sophie: "That'll save me a few round trips to Earth. Alright then, time to make me a wonderland!"

With a carefree spirit at your helms, you run around the asteroid, spreading magic all around. Hours pass with haste, and little morsels of landscape begin to sprout out. Air, sand, water, clay, different types of stone and even trees! But no animals of any kind. Without them, your planetoid, serene as it is, is but a desolate curiosity.

Sophie: "This place needs to liven up! Now what can I do...?"