Despite the inherent risks in a demonic summoning, the thought of remaining a female and becoming the class laughing stock was too much for the young (wo)man to contemplate. Quickly skimming through a second hand advanced demonology textbook (s)he found cheap, Coal found a basic summoning circle design, and after an hour or so of fear driven research had the spell prepared. Xan sat quietly in the corner, jacking off watching his mistress prepare the summoning. Xan's discharges now intermingled with the chalk and mystical powders of the summoning circle.
While (s)he had been working, Coal had continued to change, but had been too preoccupied to notice. Originally slender, pale and beautiful, coals skin had darkened to a luscious red, her curves growing increasingly lush, and her beauty becoming less and less human. While mostly hidden by her lush raven locks, as Coal prepared the circle, Xan was increasingly treated to tantalising hints of budding horns and lengthening ears, as well as lengthening canines and nails. Coals pants and shirt were becoming increasing tight, with the increasing slack in the waist rapidly taken up by her growing breasts and widening hips, her hardening nipples becoming more and more obvious.
"Alright, that should do, and if you do anything to mess this up, Xan, I will do Horrible, horrible things to you". Xan could only squeak in reply, staring at Coals dark, serpentine tongue unconsciously slip between dark pouty lips, her threats, uttered in her new, sexy drawl making Xan even more tuned on.
Coal began the summoning, chanting the complex phrases with ease. To Xan, who had heard Coal summon minor beings before, and had long before answered such a summons, Coals new body changed the normally crisp, measured intonation into something far more wild, dark and erotic. As powerful magic forces lit up the makeshift web on the ground, the fallen cum began to writhe where it lay, further insinuating into the complex pattern, slightly altering it.
Coal knelt on the floor before the circle, too caught up in the moment to notice anything out of the ordinary, her chanting becoming more and more like moans of ecstasy as the power of the spell built with in her shapely form, her body undulating in time to her impassioned chanting. As the spell reached its climax, Coal gave one last orgasmic shout, and was caught up in an answering wave of energy.