You were an angel who fell from heaven because you were prideful and you wanted to be like God so you and 1/3 of heaven rebelled and fell got mad you eventually learned about a new race called man so you want to test something see if humans are able to be tempted so you leave hell and go to the garden of Eden and see the woman so you possessed a snake and slithered on up to her and spoke she started at first but then calmed down spoke

Eve: I didn't know snakes could talk