Well, after looking at the artwork in question, I have to say that if it is humor you are going for in this story, then in my mind at least, it just doesn't get any funnier than:

"Severus: *pauses thoughtfully* Well, I would say "I'd have a mental breakdown," except for the small fact that if I did find myself in that situation, it could only be because I'd already had one."

That had me rolling on the floor. Ah Severus, that sweet, sweet sarcasm - it gets me every time! :-)