Seriously, this cracks me up. I think it's great that this quiz just happens to include slashy couples like it's totally no big deal. Aww.
ETA: Actually, what really cracks me up is the prospect of Draco and Tom Riddle having a nice, cozy, domestic family together. Heee.
OK, totally just kidding. I'd suppose that Draco/Ginny works in much the same way that Draco/Harry works. Or Pansy/Ginny.
I think it's only Draco/Pansy and Harry/Ginny that have not enough chemistry for reasons of sameness of personality, for me. I'd give Draco/Ginny and Harry/Pansy a try, for sure!
That's sort of hilarious, but also sounds frightfully romantic a the same time. :D
I mean, I can totally understand why you're mortified, but it's also very sweet that your parents have such a fun relationship dynamic. :)