This is awesome. Mack's storyline and the Ursus interactions should be really interesting. I've been waiting for this from the beginning.
You are a great writer with a wild imagination and have a talent of choosing the right porn actors for each character, all hot and fit perfectly their personalities.
One question: who's the actor that "plays" Luke? That dude is just incredible, I don't know how I've never seen him before. Perfect combination of muscle, hairy body and uncut cock with the cutest face.