Shape shifters One form of limitations could be that the shapeshifter needs an animal pelt, such as the selkie skin, or forms of the werecreature myths. In some werecreature myths, the person could only shift with the removal of clothes, and only become human again by putting on their clothes again.
Finally! Also, remember to research how big the wings need to be to actually be capable of flight.
It really works --http://chir.ag/projects/tip-of-my-tongue/
I have an idea for a story kinda like this,,,,,
Imagine if the person 1 is really artistic and person 2 is a writer and in exchange of the drawings he writed short stories for his/her soulmate.