Stopped in Time

I know marriage law stories have been done to death. But the light side has been bamboozled by Umbridge and Harry refuses to marry Pansy. He will get it stopped even if he has to work with the Slytherins, house elves and Snape. Time travel and Canon pairings. Starts about one month after the final battle. This is story challenge 1 in the series of 2 for now.