Wait... Astoria was in Slytherin? When was that proven? I always thought her House was unknown.... I know that's probably the most realistic House, but I would never consider it canon unless JKR said it.

Anyway, the obsessive Drastoria fangirl inside of me is screaming to refuse the existence of Harry and Astoria, but I know everyone has their own opinions so I'm not going to let myself freak out. I'll just go read some Drastoria Fanfiction or something...

Daphne

Don't know much about the Greengrass sisters but pansy was a bitch lol

Daphne is Astoria's sister, right? haha, that would be hilarious. I'm already liking that pair more than Harry/Ginny

Or Daphne, since we don't really know either sister. I just chose Astoria because from what I remember, she's the older sister.