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.
From an artistic perspective, this is not my best work. However, I still like this piece, as it's one of the few times where I've really explored how the crossover would turn out. I think I managed to get a pretty good feel for a sexual relationship between these three, and it's a lot funnier than it is sexy. What'cha gonna do?