COY stands for Cross Over Yuri. The premise is pretty simple, I have a list I've compiled of over 500 cute girls from various anime and manga. I then use a random number generator to make pairing, which I then draw. Every third picture is a threesome.
This might be my favorite COY so far. Not only is the pairing great (I mean, really, what're the odds of landing on those three out of a list of 500+?), but I'm actually pretty happy with the art, too. This was the first to be fully colored with my current technique, although I think it's clear I was still working a few bugs out at the time. All the same, I love it, especially Miku's cute little toes.