Something done a little while ago. I usually like drawing ponies to relax and take a break from really complicated stuff, so this happened.
My waifu and I were thinking of headcanons, and we thought that Pegasi probably preen each other's wings as a form of bonding and showing that they care for each other. Rarity would want to impress Varnish and so she has Stained Glass teach her how to do so. What ends up happening is adorable things! :V

Rarity, MLP:FIM (c) Lauren Faust, Hasbro
Varnish & Art (c) Myself