Black hide and fur cover Damon's whole body from head to toe. His face push out into his new Bull snout.
His hands and feet fuse together as they change into his new cloven hooves as he fell on four legs.
6 inch horns then grew on top of his head. His ears then went to the top of his head and becomes pointy.
He then had a bovine scrotum as his butt change to look more bullish. A tail then came out finishing his changes.
When the fire clear. Damon was now a Bull as he looks over his new body. "Whoa this feels amazing."
Looking in a puddle. Damon see's his reflection. He was a spitting image of Bories.
"Remember Damon. I owe your soul. When I return. You'll be mine." The devil was now gone.
Damon wonders if giving up his humanity, and soul, was worth it. He then felt Bories nuzzle him.
Bories just moo hapily. Damon just smile. It was worth it to be with Bories.