Seeing as he was powerless to resist Xan now that he was smaller than him, Coal did as he was told and gave him a blowjob. It was hard to do given how much big Xan's dick was. Despite being only 2 foot tall his dick had to be 12 inches long at least. Coal could barely handle a couple of inches of that with his new height. But that didn't stop Xan from trying to thrust his dick further into Coal's mouth. Soon Coal felt a gush of demon seed shoot down his throat.
"You're a good little cocksucker aren't you," Xan said with pride in his voice. "And soon you'll be able to handle a lot more."
"What do you mean?" Coal said as he wiped the excess cum from his chin.
"When humans willingly consume demon fluids directly from the source they become more like the demon in question. As a lust demon my body is designed to handle any level of insertion and in just a moment so will you."
Coal could tell than Xan wasn't lying. He could feel his insides changing. His ass felt as if it were expanding despite the fact it wasn't actually growing. Coal knew that he had to find a way to return to his original size and take back control. But at the same time he felt a strong urge to let Xan penetrate his ass. What should he do?