Jim stood, bringing Sister Mary to her feet as well. His skin was turning a dusky red, and his eyes shone malevolently. He picked up the nun and carried her into the main hall of the chapel. He set her down behind the pulpit like she was about to give a sermon. His tongue extended out unnaturally, wrapping around the side of Mary's face. She turned her head slightly, allowing it into her mouth. She leaned into the pulpit, resting her exposed breasts on the smooth wood surface. Moaning around Jim's tongue, Mary managed to say "Yes, you are almost complete. Defile my body in this house of God and bring forth your true power." With that, Jim plunged his shaft into her. Mary grimaced as her walls were stretched to the point of ripping. Behind her, she could feel Jim's body changing, growing larger. In the shadow he cast before her she could see large horns curling up from his head. Blood red arms held her in place while his long tongue coated her torso in thick saliva.
A long red tail came into Mary's view. As she gasped for breath, it positioned itself in front of her face. Mary began to lick and suck on the tail as if it were a cock. Suddenly, it pulled out of her mouth and disappeared behind her. A sharp pressure on her ass told her where it was going. The saliva-slick appendage wormed its way inside her, thrashing about until she came. As Sister Mary's orgasm subsided, a lance of fire shot through her insides.
Screaming as Jim filled her with his demonic essence, Mary began to transform rapidly. Her eyes glowed with inner fire as fangs extended from her mouth. Pulling back her cowl, she could feel her ears growing pointed and moving up her head. Her breasts swelled even more, and a patch of white fur grew between them. She gripped the edges of the pulpit as she felt her face changing, the bones shifting about and growing longer. As the changes increased, she gripped harder until she heard wood snapping beneath her hands. The fur covered her breasts and continued to spread. Her ass and pussy were on fire as Jim continued to corrupt her body. When Jim finally stopped, neither of them were human any longer. Jim had once again become a demon. Mary had become some kind of cat-creature. She looked at Jim lustily and purred, "What is your bidding, Master?"