Fascinating story! I love the way you depict the formal Pureblood courtship rituals - and the way the younger generation starts to mock them.
Your Rabastan has all the marks of Canon!Rab already, one can see how thing will go completely wrong. Yet at this stage they could so easily have gone right after all, as well.
And Poppy is a triumph! In the middle of this old-fashioned courtship-ritual, you have such an independent, powerful Poppy, who is very much her own woman, and who even takes much of the initiative - the way she handles the voyeurism-scene is great!