You and Joanne go at it a few more times, each time possibly better than before.
After a few hours, it has gotten very late and you are too exhausted for another go. You suggest the two of you return to your place for the night.
As you gather your clothes, Joanne asks how she's supposed to change back. You admit that you don't know. By the time you've gotten dressed again, Joanne still hasn't changed form at all. You collect her clothes as well and barely manage to carry her back to your car and put her in the back seat. You find a towel and try to dry her tail off (it usually works in the movies) but to no avail - her tail remains.
You deciede to check the potion bottle to see if there are any clues...