Justin walks in the loft after hitting his head
I know someone has looked for this fic earlier but after hours for searching it I can't find it from the tags.
All I remember is that Justin and Brian are not together. Justin somehow probably hits his head and gets memory loss, might have been at his studio. Then he walk to the loft like he and Brian had never broken up and might complain about his headache and say something about how he woke up on the floor of his studio.
FOUND, thank you soozz86