Dave still feels scared, but Cora's voice and words reassure him. He relaxes, allowing himself to feel the changes washing over him. When he does, his hair slowly recedes into his skull and his face pushes outwards into a snout. His speech turns into swine sounds as he begins to mentally embrace the changes, feeling more and more like a pig.

Idea by me.
Art by https://www.furaffinity.net/user/rexequinox