Coal slowly walked forward, his massive legs rubbing against one another, the giant muscles rippling under his skin with every step. He looked down at Xan, taking in his familiar's greatly-changed form.
The small, mischievous imp was gone. In his place stood a six foot tall, five hundred pound beast of muscle and cock. But those were hardly Xan's only changes. His horns had become longer and thicker, and curved back from his head wickedly. His tail was thicker and longer, and it swayed behind him seductively. His hands and feet were powerful claws, and a pair of odd lumps had grown across his hugely-muscled back--wings begging to break through the skin and be free.
Xanandar grinned up at his master, and began to slowly float, his clawed feet leaving the ground. "Oh master!" Xan rumbled, his deeper voice full of joy. "I can feel it. So much more power than before! I can feel it running through me!" As if on cue, red energy bolts moved up and down Xan's body, leaving little wisps of fire and smoke behind them before disappearing again. "Yes!" Xan enthused, "I've been promoted! I'm not a mere imp any more, master! You've made me more!" Xan floated toward Coal, arms wide, and hugged Coal's massive chest. "Thank you! You're the best master a demon could have!"
Coal was admittedly a bit confused by what was going on. But as Xan hugged him, Coal couldn't help but return the favor, wrapping his enormous arms around Xan, hugging his familiar tight. Xan had been mischievous to a fault, often to the point of being a royal pain in the ass. But for an imp, he had been surprisingly good-natured and loyal. Coal couldn't help but be happy for his familiar.
Coal broke the hug, and stepped back, looking Xan over with a critical eye, "Well, you're certainly much bigger than before. And your horns and tail are much more impressive..."
Xan beamed at the praise, thrusting out his muscular chest. "Oh yes, sir! I'm not a full demon. Well, not yet. Right now, I'm just a "lesser" demon. One of the many terms they use to keep us in line, I think. Full demons have wings and much bigger horns, not to mention incredible magic! But I'll be one someday, just you see! I used to think I would be an imp for all eternity, but since I met you, I knew that wouldn't be my fate!" Coal grinned back at his enthusiastic familiar.
Coal wondered if he could give Xan that promotion, right then and there. To be sure, it might not be a good idea--a bigger, more powerful Xanandar might be too much to handle, after all. But Coal suspected that his cum would be enough to do the trick--after all, it had brought Xan this far, hadn't it?