Fell For Those Emerald Eyes

What if on that early November morning, Vernon and Petunia Dursley eagerly accepted young Harry James Potter as their son? What if Lily Evans Potter had been more prepared for this event? What if Dudley Dursley was magical? What if Harry was extremely powerful? And how does Severus Snape tie into this? I will try to keep the Dumbledore bashing to a minimum. OOC Dursleys, AU.