Imagine Tonks & Lupin survived the Battle of Hogwarts and they have Teddy and all that crap.

They raise him as a loving family and Lupin then got to teach D.A.D.A again.

So one day, as a 14 year old Teddy is sitting down at Hufflepuff table, he receives a Howler from his mom, Tonks. He thinks it's bad and starts to freak out, but then when he opens it, it's like

"TEDDY, GUESS WHAT? THE WEIRD SISTERS ARE COMING TO TOWN!!!! PACK YOUR THINGS, SON. I ASKED MCGONAGALL ABOUT IT AND SHE SAID IT'S COOL. MERLIN'S PANTS, I'M SO EXCITED!! DON'T TELL ANYONE, THOUGH, OKAY? MAYBE YOU SHOULDN'T TELL DAD EITHER. FUCK, IS THIS A HOWLER? I FUCKED UP, I FUCKED UP!!!!"

And then Lupin is up at the staff table just all smh and covering his face to hide his laughter.

All the Muggle borns are all like "WORDL STAAAAAAAAAAAAAAAR" while the teachers are all confused.