Forever (Neville Longbottom)

Anne Potter is Harry Potter's adoptive sister. They've been living with the Dursleys for as long as they can remember.
What happens when Anne goes to Hogwarts and accompanies her brother on his adventures? What does she do when she learns about her true origins? Does the truth make her weak or stronger? What happens when they find out that one of their parents is still alive?
What happens when she falls for a seemingly clumsy Gryffindor, Neville Longbottom?

Teaser-
"Neville?" I asked, he hummed. "Will you always be my friend?" I added.
"Of course I will!" Neville answered almost immediately.
"Forever?"
"Forever"
His answer made my lips curl up into a smile.

Rankings-
#1 in harrypottersister (08/08/2021 - 18/08/2021)
#7 in neville (30/05/2021)
#15 in longbottom (10/09/2021)
#10 in harrypotter (29/08/2021)
#2 in longbottom (1/04/2022)