Harry's Older Sister?!

What if Draco was less snotty and stuck up in his first year?
What if Harry accepted Draco's hand and they got along really well?
What if everything they've done up to a certain point in Hogwarts was all set up before they were even born?
What will happen when Harry finds out that he has an older sister and is now Draco's adopted older sister?
What will happen when all of the secrets that Harry's sister found was slowly starting to unveil themselves to the outside world?
But what will happen when Harry's sister finds out that their parents never died?
And what will happen when someone finds out that Harry is actually a cross-dresser?

ATTENTION!!
I do not own the Harry potter series.
For if I did there would be more Boy snogging than girls.
I only own the characters that you don't recognize
Owner of Harry Potter characters, setting and book is non other than J.K. Rolling

Also, depending where I want to take the plot there may or may not be smut.
And that mostly depends on if I feel up to doing it or just leaving it up to your imagination.