Oh wow. Wow wow wow. God, there's something about consensual public humiliation that's so incredibly hot (and it has to be consensual or else it's just not hot at all, you know?) It's all about how the sub actually really loves this, and with the veritaserum, you know he does, so you can just sit back and enjoy all the filthy hotness knowing Harry's enjoying it too. And referring to it as a 'verbal striptease' is just spot on. Spot. On.
Your dirty talk is superb. It's almost hotter hearing Harry talking about what they get up to than it would be 'seeing' them get up to it in the story. Almost :)
Oh, but the ending nearly killed me. Why can't they be a public couple? Not the BDSM-ness being public, but just the couple-ness. I don't understaaaand! Now I need to know more about their backstory and the social situation in the wizarding world. What don't we know that makes Draco think they need to keep quiet? Gah! But at least Harry sees through Draco. That was beautiful, and I loved the call-back to canon to make it clear. Well done, you.