Finding a fic I've read awhile ago

I ​vividly remember a scene where they were both talking in Macdonald's (or som) and Hermione met them there. ​After that she and Tom (or maybe Marvollo???) started owling each other about books.

​Tom stidies in the Durmstrang, I think, scaring Karkaroff a bit with how 'similar' he is to the Dark Lord.​

Possibly a time travel fix it, or something similar where Harry revives Volandemort

Sorry for the little details, I remember it badly. Looked through 200 pages of history and didn't find it. Was it deleted?