Xenobiology - Different species means more than different skin colors. It means different entirely different physiologies. Having friends whose bodies work so differently from your own can make things complicated, as everything from how you relax to how you dress and what your beauty rituals are (what is "lekku buffing", anyway?). How do your characters deal with differing biologies that they encounter?
Smuggler Nic. 250 words, no spoilers.