Looking for fic

[andromedao]

Looking for a fic where harry is a Duke and he finds out by buying a genealogy book for Petunia. Petunia is a stickler for protocol and standing and they start teaching harry how to act for his station.

 

[andromedao]

Found it it's a certain level of society it can be found here

https://quantumbang.org/a-certain-level-of-society-by-meyari-mcfarland/