Looking for a funny oneshot I read years ago?

It was a harry potter story, basic summary-Peter Pettegrew 'wakes up' in the middle of a conversation with James, mand realizes he went back in time. James asks him to be the secret keeper and Peter says that wouldn't be a good idea and shows James his mark. James is upset, but Peter convinces him that he woke up one day after getting really drunk and it was there, he thought it was a prank by Sirius untill voldemort summoned him. I can't find this story anywhere, I'm pretty sure it was in somebodys Plot Bunny storage dump story, but there are millions of those.