Harry comes back for seventh year along with Hermione and Ron, only to find strange things afoot - unsurprisingly, with Slytherins in the thick of them.
At some point during the aftermath of the final battle, and despite the concerns of the newly restored Head of Slytherin house, Harry attempts to return Draco's wand.
A young Scorpius Malfoy sets out for the Forbidden Forest to help Professor Longbottom repair the damage done to the school garden and finds more than he bargained for awaiting him in the woods.
While serving a detention for Filch, Draco discovers something that Potter doesn't know about and can't wait to rub his nose in it. What he doesn't expect to discover is the fact that he and Harry share a grief from the same source. Post-DH.