Disclaimer: I do not now or ever have owned any of the characters associated to JK Rowling's Harry Potter series.
HGGG pairing
15 years after Hogwarts: 15 year reunion
The class was smaller than what it used to be. Course that is only due to the epic final battle and the destruction of Voldermort. There were once again a continuation of the hunts for death eaters. Only a few were left out in the world, hiding from the Ministry.
But as for their children, they all realized that the battle of purebloods and muggle-borns was as futile as the racism between muggles between black and white.
A large barn owl flew into the professor's office, stopping on the perch and dropping a letter onto her desk. Hermione gave the owl a treat and it flew out the window. She looked at the letter only to see Dumbledore's handwriting, and dreading what it was to say. Another student complaining about her teaching methods? Or another professor complaining of her comments on their teaching style?
Hermione opened the seal a found an invitational envelope with her full name in script.
Confused, she opened the envelope to find an invitation to return to Hogwarts.
'Wait, I'm already here, have been for ten years' she thought.
Continuing her reading of the invitation she found that it wasn't just and invitation back to Hogwarts, but one specifically for her 15 year reunion.
She realized that she would finally be able to see all of her old friends after 13 years of separation; course that's only if they all agreed to return. Hogwarts held a lot of memories for everyone, both good and bad.
Hermione sat there in silence pondering about if her old classmates would return. Or even if those professors who had retired would return to help celebrate.
But her thought process didn't last long before she realized that it was almost time for her arithmancy class and there was a large probability that she was going to be late.