Ahhh, my dear, this is fabulous! I'm just a sucker for magical bondage, especially of the Snapey green Slytherin sort. Severus's expression is perfect: just a bit of an "I'm in control" smirk, since when you're genuinely in charge, you can afford understatement. Of course he'd insist on something like that top -- sexy and with just the right touch of playful humiliation (Excellent use of color overall) Minerva's expression is just right, too, as are the stockings. Love both their hair, well, all their hair. . .great job.
Thank you, thank you!