A fantasy AU of HP.
In a world of heroes, nobility and all manner of magical creatures, you would think this to be a simple and ideal world, yet you would be wrong.
Most of the princes are lazy, pretentious layabouts who have never lifted anything heavier than a quill or silver spoon, and those that claim to have a truly martial upbringing or hail from chivalrous families have never seen actual combat. And those that rescue princesses from all sorts of nefarious dangers aren't the ones who rescued those princesses in the first place.
For those who want a princess for a wife but don't want to do any of the legwork, they hire a mercenary who then dons the Prince's armour and wear a helmet to conceal their identity and rescue the princess who is usually none the wiser.
Harry James Potter is one of those mercs. Taking an altogether risky job that other mercs won't touch involving infiltrating an island concealed by magic and inhabited by strange creatures known as Veela, the problem isn't getting to the island, it's getting out. Harry takes the job mostly because of the promised reward involved; the job is infiltrate the island and take one of the Veela maidens living there and bring her back to be married to the son of a high ranking lord.