This makes the top on my list of weirdest ponies I ever had to draw. And I dont even have a list! D:
So apparently, these are two unicorn brothers who have the ability to join together into one body (I really dont understand the necessity of that ability, but whatever!) My brain fizzled out as this concept was explained to me and my commissioner didnt understand it either, but wanted to see it happen. So here's the end result.
Im going to assume that when they unjoin themselves, they each have an arrow cutie mark.