Platonic Friends is a side project between Emilie and Marc Senter (who I'm 90% sure is her boyfriend). It has nothing to do with The Asylum or the book. It's a separate work and they've promised that a single will come out soon, so they're a band.
Some theorize they're a band that's in a movie, too. But that's yet to come to light.
Pandora505 wrote: have they produced something yet other than a poster?
I believe that Marc Senter acted as the warden who gave Emilie or Emily with a "y" the key in the music video for "Fight Like A Girl" as seen in the video below.
I also think that he appeared as the Scorpion together with Emilie as the Frog in a scene from the film "The Devil's Carnival". Aside from that, I'm not aware of anything they've done together. Here's to hoping that, whatever it is that they're working on, is released soon. ^_^