Everlasting Rose

The day Harry Returns to Hogwarts He gets a Letter from an unknown Sender. Inside is a rose that is very rare and only blooms once every 1000 years. To give someone this rose literally means "Utter Devotion." Who Gave Harry This Rose? Contains Severitus, DracoxHarry, RemusxSeverus, BlaisexNeville. Disclaimer: I don't own the universe or characters, but the story itself is mine.