I was so pleased to see you'd written me Dudley/Millicent! That's a pairing that seems to make for great stories. And now I've read it, I can confirm that here's another very readable and thought-provoking one, which takes them as mature adults with adult concerns, and far more flexible than they were as teenagers. (I'm only sorry I couldn't read before – I've been running like a rat, doing unavoidable stuff, but it was good knowing I had this pleasure waiting for me.)
I like the way they've both had lives, learned from them, grown, and seen the wizarding world change – for the better, it seems. Even if their personal experiences haven't aways been happy – neither could have expected it to be roses all the way after their first 17 years! I like the way Dudley is so committed as a father, not just determinedly adapting to the wizarding world himself, but doing his utmost to ensure his Sarah will be happy there, and have as many advantages as he can get for her. A very Slytherin approach, that, which won't do him any harm with Millicent. And boy, is he going to cut a swath through its business world! Poor innocents.
Last thing – the way they appreciate each other's physical being is very attractive. Dudley's instinctive response to her dark hair and creamy skin as well as her height and strength; her liking for a big man who feels solid and safe.