Everything is against their relationship.
But they are against everything.

Catherine Gral and Draco Malfoy (6th year Gryffindor and 6th year Slytherin) at Hogwarts Grounds during one of their walks. They rarely go out of the castle because they don't want to be seen by someone. They often meet in Room of Requirement. White rose is really important for both of them.
Cate is the only person who knows real Draco and she's the only one whom he somehow trusts; but she doesn't know about that Draco's blackmailed by You Know Who (she only suspects sth..) but their choice was to not talk about all Potter's, Voldemort's, OotP and Death Eaters stuff. It's difficult but they're trying...

Their relationship is full of difficulties just from the beginning. How will they end? How did they start? Who's Cate Gral for heaven's sake? Hope that you'll know soon - when I'll start typing out/rewriting my FF (which is huuuugely based on original books - actually I've added my chara to OotP, HBP and DH and I've developed another characters plots - that's all but still.. someone can say that it's crap idea but it's MY idea and I'll love it even if it'd be a piece of sh*t for someone. It was born in my mind and I'll *die* if I would not write it)
EDIT:
Ya' know, today I've learnt about MarySue-ism. And I'm just angry about that. Because when I think about that my chara has some MarySueish features and what? Someone will tell me that's sh*t because she's befriended with Golden Trio or in love with Draco Malfoy, without reading whole story? It's too cruel for me. I support being creative. If you're trying to do something and use your imagination, I support this. But I must admit that they're not normal characters (like half veela, half werewolf, half phoenix (!) with unicorn animagus form - not too much? ) I think you can have marysueish features, if you use it moderate and in logical way. I still like my character and the story so I hope to post it in 2008 year. and I hope not being blamed because I do this for my own pleasure.
Yeah
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So... Cate Gral is my OC in JK Rowling's wizarding world and in manips she's presented by me (because if there'd be a movie I'd play her) so she belongs to me
Draco Malfoy, Hogwarts and wonderful world of 'Harry Potter' belongs to marvellous JK Rowling
Tom Felton belongs to himself XD
But picture of Tom Felton and Hogwarts belongs to Warner Bros. Pictures (i've found them here: [link] and [link])
White rose image is from [link]
And little fun --> look at Winamp sign ^^