steady rollin'

You've never drawn shibari? Wow! I'm honored to be your first, then! ;) You certainly did it very well, and got the emotion of the piece perfect! Definitely a ritual between them - I think that's why I like the look of shibari better than the thought of just "someone tied up". It's the symbolism, the giving up of control, the intimacy. If there was ever anyone in HP-verse (or most other 'verses) who NEEDS to do that, it's Severus! :D