This class is filled with beakers and chemical agents, as well as small demon bodies soaking in fermaldohide, awaiting disection. Coal has learned that this class is all about learning how the physiological aspect of Demons works.
His professor is a gaunt man, and tends to joke around a bit. He shows the class all sorts of interesting things about demons that have nothing to do with the subject. Though he does explain that the mixture of thier blood with humans, or other various fluids in a human, can result in unnexpected changes.
"What type of changes?" Coal seems exceptionally intrigued
"Well, some miner physical alterations, the growth of muscle, horns, the shifting of skin texture, even ones personality can be significantly altered, remember class, demons are not toys, you should not go wandering around willy nilly summoning whatever you can from random books." The teacher goes on to explain how to mix demon blood into potions of various sorts, as Coal begins to experiment he feels a tug on his pant leg.
"Psst! Hey, stud, its me! Watcha doing up there?" Xan, escaping the dullness of his room, is staring up from between Coals legs, his solid black eyes beeming up in curiosity.
"What?!" Coal lowers his voice to not arouse suspicion "Didn't I tell you to stay in the room?"
"Yeah, but, after clogging up your toilet, I decided not to wait around for the plumber. Oh, by the way, i'd invest in life jackets if I were you."
"Oh, god Xan, fine, but behave in here ok?! I'm mixing a potion, and I don't want to get it wrong."
"I could give you a blow job, i'm the perfet height! No one will know!" Xan reaches twords coals pants and undoes the zipper.
"Xan!" Before Coal can stop Xan, the little mound of demon muscle has completely engulfed Coals dick.
Coal, is completely distracted from his project, and not paying attention to what he is mixing at all. The class is supposed to return to thier dorms, swallow the contents, and observe the changes while recording them. He forces back a moan of pleasure as he cums in his familiars hungry mouth, and feels his spent dick being shoved back into his pants.
"Ok big guy, i'm done, lets get back to your room." Xan's naked body saunters out of class, his tail swishing behind him. Back in Coals room, the two stare at the contents of the flask they mixed in class
"Well, here goes..." Coal pops the cork