I think you could still do a Masochism Tango theme with one of the prompts, like so:
#8) Severus is determined to get his reward (and revenge) on Harry Potter. First, he wooes him (start of the dance), then they dance at a Ministry function (an actual Tango), then Harry agrees to return home with him, at which point Sev brings out the bondage (set fire to his tie!). You could even end it with Harry liking the abuse and coming back for more ("my heart is in my hand -- Ewww" *drops heart on floor*)!
OR
#4) Severus comes home to find dark!Harry and his new Death Eater follows ready for some fun. A tango plays in the backround. "Eenie" Sev gets slapped. "Meenie" Sev is asked to drop to his knees, arms over his head in submission. "Miney" Tiny whip marks are made as his clothes are slowly shredded. "Moe" DEs burn their initials into his shoulders with their wands.
OR you can make up your own scenario. Just trying to help the brain-storming bunnies!