If I'm not wrong this is set in year six. There is a sequel to this story as well. A few basic points that I remember about it:
- Harry and Ginny are together
- Ron and Hermione are together, but they break up a bit later (in the sequel Hermione and Snape become a thing)
- Mainly set in headquarters of the Order
- Harry is trained to be an animagus and it turns out to be his is a Phoenix
- Year six and Sirius is alive read it on FanFiction.net
Does anyone know what this is?