The Vow And Its Consequences

Dudley demands to go to a fair, it so happens to be in Cokeworth, where Petunia grew up and during the summer...where everyone's favourite hermit called Severus Snape lives. The Vow comes into play and needless to say it has consenquences but who for? Dumbledore? Harry? Severus? Voldemort? well all we can do is wait and see...and hope for the best. Severus rescues Harry story.