OH. MY. GOD.
I've read it twice, downloaded it, read it again and it's just perfectly, kinkily, naughtily right!
The characterizations in the verses are just awesome, sexy and funny and very much in character as I think of them. The verse itself is wickedly sexy and witty.
And the illustrations are perfect young and naughty Snape is delish! I have a special fondness for the one on page twelve, too. *grin* Snape's feet just say it all so eloquently! I think my favorite pic, though, is the one on the last page - the texture of the coat over the shackle is just amazing, you want to reach out and touch it with your fingertips. I'm such a detail freak for stuff like that.
The ending verses are the ribbon on the package, and you are a wonderful and talented individual. What a treasure of a present! I literally can't thank you enough.
P.S. I wrote the first Snilch you read? That's some awesome story karma. :)