For Sirius Black, Regulus has always been his everything, and Regulus must always be safe, even if that means bringing attention to himself at all times. But life plays it that as he tries protect his brother, he starts making friends that take him further and further from him.
Harry is putting his wand in Dumbledore's tomb. And the wand, with all its mighty power sends him back to fifth year.
Harry and Ginny's marriage is falling apart, their children the only thing keeping them together. When Harry bumps into a seer, he gets asked a question that he can't get out of his head, "What do you want?" - Featuring 37 snakes, Albus and Scorpius providing too much PDA and Draco Malfoy stating the facts.
In the summer before fifth year, and Moody and Kingsley, conduct a ritual to bring the most powerful person in Grimmauld Place's past self, at the peak of their power. The ritual, seeing the Horcrux in Harry's head and pulls Tom Riddle, 15, in the middle of the London Blitz asleep in a tube station, to Grimmauld Place. (Friendship, inspired by Diablerie)