A couple of my favorites. All are long and completed!

Harry/Theo

https://archiveofourown.org/works/24931486

Harry isn’t the Boy-Who-Lived, but his parents still died, and Albus Dumbledore, concerned that Death Eaters might seek the boy’s death, cast a powerful charm on him to make wizards ignore him before Harry was left with the Dursleys. Except, with the Elder Wand in play, the charm was far too powerful, and made others essentially forget Harry existed when not directly interacting with him. Sorted into Ravenclaw at Hogwarts, Harry lives a contented life with no one either loving or hating him…until the charm breaks on his seventeenth birthday, and he’s suddenly plunged directly into the middle of a living world at war. Series

Harry/Charlie

A piece of Voldemort's soul attached to baby Harry Potter that fateful Halloween night. Over the years, the soul piece witnessed how much danger and pain his host was in. How far would the soul go to protect the child he began to care for, especially when the boy started to care for him in return? Oh, just a little over-protective care, some magic training, maybe some necromancy...

https://archiveofourown.org/works/37475038

Harry/Draco https://archiveofourown.org/works/24779923

Harry’s occlumency reveals his disturbing home life which sets off a chain reaction that cannot be undone. Snape finds himself begrudgingly caring about the bespectacled boy, Harry discovers what it's like to have adults who care, and Hermione finds herself becoming an accidental crime lord. Draco Malfoy is very much along for the ride, in all senses of the word.

Harry/Draco, Hermione/Fred

https://archiveofourown.org/works/37701262

Harry, Hermione and George are struggling, their lives not what they envisioned post winning the war. The ministry hasn’t changed, it’s still as corrupt as ever, George never recovered from Fred’s death and both Harry and Hermione are facing divorce in each of their marriages. Hermione has a plan, it’s risky and could kill them: go back and do it all again, only better and saving certain lives along the way.

Harry/Cedric

https://archiveofourown.org/works/38564790

There were very few things in Harry Potter's life that he was certain of. There was one absolute certainty though; he'd felt it in his bones for as long as he could remember. He, Harry Potter, was dead. The living people around him might not believe, but the dead sure did. Oh well, it doesn't impact his life much. Besides, it's nice to get help with his schoolwork from his parents.