Like Grains of Sand in the Hourglass (гет)

During the Battle in the Department of Mysteries Nymphadora Tonks finds herself thrown back to the beginning of Fifth Year. With two Tonks walking around and her faith in Dumbledore eroded what's a Metamorphmagus to do? Protect Harry Potter at all costs, that's what! Tonks ends up crafting a new identity for herself and infiltrates Hogwarts to fix the future. Pairing: Harry/Tonks. Cross-posted from FanFiction.net.