You are Maria. You are part of a specialized exorcist execution squad sent by the Vatican to exterminate demons and anything doing with the supernatural or occult which currently invaded the human world. You are one of the Aces of that group (consisting of you, Tatiana, Eleonora, Zita, Camelia and Lobelia) and your fellow nuns nicknamed you "The Saint Guillotine" due to your thorough swift brutality with which you killed demons. During a raid you killed so many demons with your squad that some of their blood tainted your body. "Ugh...what is this stuff?" you say in disgust while wiping it off you. After finishing the mission you return home and after resting a bit you look in the mirror and saw your chest growing rather large making your back hurt. It seems that demonic blood began working it's magic on you and not even holy water could repell it's influence. Six hours later you began feeling an irresistible urge to lust for your fellow nun and began having fun with one of them. Your skin reddened a bit and became scaly like a dragon. Horns began growing as you violated that nun and a pair of wings emerged as well. 42 hours later and you began growing a scaly red tail and looked even more demonic as your eyes glowed golden.
"Welcome to my church!" you say with a sultry sadistic voice towards some of the nuns you demonized (Zita & Camelia). They smiled wickedly.