The story was too short, but in this case I was OK with it, because I didn't have to spend more time with the happy couple than I absolutely had to.
Bigger meaner subs are not my thing and in it's own twisted perverted way the length was perfect.
I did love the very first (chronologically) scene with Ralf and Max, the way Ralf claimed his oversized boy-to-be so effortlessly. That scene was worth 5 stars to me :)
On the whole it was a pretty sweet story and I did enjoy it.