Dudley and Dumbledore work together to teach Dudley how to use magic to assist against Voldemort, Dumbledore uses Dudley as a secret weopn

sirius black went through the veil and survived. no one knows what the veil really is. the veils brings Sirius black to a parallel dimension where everything is different friends are still alive and it is up to him the aurors and the minister(who is a shocking character) to try to find away to cross the veil. it is a both dimension fan base story