2 Works by sarcastic_fi in Harry Potter - J. K. Rowling
Harry, at 22, thought that he didn't need his adoptive parent Severus Snape any longer. He thought teaching at Durmstang would free him. However when a scandal sends him back to England, his guardian is there to remind him how much of a failure he was and inform him that because he unwittingly declared himself a Submissive in front of the entire Wizarding World, that he is now legally obliged to have a legal guardian until he is collared.
James Potter is the Savior of the Wizarding World, Harry is his nonentity son. James has turned to alcohol in the past allowing Harry to bring himself up. It's only when Sirius and Remus intervene that Harry finds out about the betrothal.
This story starts with Harry aged nine - nothing sexual happens until much much much later (promise!).