there will come a time, you'll see (джен)

They have Shepard’s pie for dinner. Ron and Hermione watch Harry fill up his plate and only start serving themselves when he picks up his fork and starts eating. Neville laughs into his wine glass.
“How are you dealing with their mothering, Harry?” he asks.
Ron opens and closes his mouth for a minute, groping for an excuse. Eventually, Ron says, “He’s just so small, Nev.”
“Hey,” Harry says. “I’m seventeen. I’m an adult.”
Ron shakes his head at Neville. “My best friend is an infant.”
 
A curse regresses Harry to his seventeen year old self, physically and mentally. He doesn’t recognise this strange peaceful wizarding world, but there are two people he does recognise: Ron and Hermione. Based off this tumblr post.