I ditto Vorona, here. Malfoy would never become an Auror. It's not his thing, and no matter how much he changed, he wouldn't play 'hero'Do you think that Draco would ever become an Auror, if he really saw the error of his ways and began to hate Death Eaters?
You've got to think about Malfoy from his POV and personality that JKR has set up. He's snarky, he's rude, he's a spoiled prat, and no matter how much life was has shortchanged him...habits are hard to break.
Also Draco would never really hate Death Eaters, and he's be constantly confused about his thoughts. His entire family is made up of Dark Wizards, he's have a hard time just discarding that heritage. >.>
He's a Slytherin through and through...he'd definitely work with the Auror (notice I didn't say "for" the Order) to save his skinny bum. But that doesn't mean he'd agree with it.
I've read two successful fics with Draco as an Auror and both of those gave loads of backstory as to why he became an Auror...in one he was disfigured. And the other, he wasn't really an Auror but worked for a sub-division (wizarding forensics)
Just keep in mind: Draco doesn't play 'hero' he's the villain in the story already.
Ditto again with Vorona. The more important thing to keep in mind here is whether Draco had changed his blood prejudices....'cause this kid would be a half-blood, and he's rather biased. If he's still prejudiced (which he would be on some level - even a tiny one) he'd have a hard time bonding with the kid.Do you think that Draco would ever become protective or feel fatherly love for a child that was not his own? if that child was Harry's?
Either way...good luck with your story!