Yes, yes, they're twins... but who else is hoping against hope that Jaime and Cersei get back together? They're just so PERFECT together! Also, there are worrying hints about Jaime and Brienne...
Have you read all 5 books?
They are perfect for each other...perhaps Cersei is a bit more evil than Jamie, although that is a fine line to draw. Brienne COULD be a saving grace for Jamie. But when the two of them are together...that keeps a few more people safe from their schemes!