Hermione remembers Fred.
Fred and Hermione can't keep their hands off of each other - it doesn't really matter to either of them that she's currently dating Ron.
Rosie Collins is, unfortunately, Lucius Malfoy's baby girl. Not that he knew it until she was eleven years old and already being raised by her muggle mother. Now Rosie's mother is dead and Lucius will do anything to make Rosie his once again. Even hold her hostage in his basement. Imagine her surprise when Fred Weasley shows up in the dead of the night, the Malfoy's newest hostage.
Fred dies in The Battle of Hogwarts. Hermione turns to George at the loss of the person she loved most in the world. Years later, Hermione has a son. George has no idea.
Fred Weasley is getting married.