It was true. The more that Coal struggled, the more muscle packed onto his familiar's monolithic body. At 26 Feet and a penis that was also probably about 23 Feet, Xan's hulking frame dwarfed that of his master's. The massive pectorals alone were enough to smother Coal's entire upper torso. He managed to squeeze his way between the demon's body and hardening shaft to the top of the pecs. He then reached the base of the enormous, thick neck, and finally to the head. It was then that his eyes met with Xan's.
His eyes were a striking purple. Despite the demon's wicked and powerful appearence, his eyes seemed to have a sort of gentleness about them. Coal placed his muscular hands on Xan's cheeks as he pulled his face in for a kiss. He could feel his familiar's forked tongue whipping around the inside of his mouth; probing him as the body that he rested on continued to raise him higher from the ground.
For a small moment, it seemed as though the world had stopped.
Suddenly, the two were broken apart. Coal had made his way to the tip of Xan's enormous dick before the kiss. That dick was still getting bigger; forcing Coal and Xan to break the connection, and causing Coal to tumble down to the ground below. He had no time to recover from the fall however, as the expanding girth was growing at such a rate that it threatened to crush him underneath.
Coal stood up, back to the tip of Xan's penis, and pushed hard against it, using all of his strength to resist being crushed underneath. He dug his heels into the concrete flooring, tearing it up as he was forced forward by Xan's thickening monster cock. Soon he found himself pressed against the too-small doorway to the dormitory: trapped between the wall and the penis that threatened to force its way through. He heard the further cracking of concrete behind him as his demonic familiar grew larger still; knocking furniture out of the way with his immense body.
Xan let out a low moan of approval. The sound vibrated through Coal's entire body.
His titanic back muscles and expansive wings were pressing up against the top of the ceiling now. Bigger and bigger the familiar swelled, the structure of the room was beginning to buckle under the enormous weight that was Coal's familiar.
"MASTER ..." Xan rumbled, his once squeaky voice low and baritone, shaking the very foundations of the room.
"I NEED MORE POWER. YOU'RE POWER IS GREAT .... BUT I NEED MORE."
"How do I know that you'll still obey me, Xan?! You're so huge you could have anything you wanted?"
No sound came from Xan for a time, almost as if he was thinking about his response. It was safe to assume therefore that he was not chained to Coal any longer. Coal, however, realised that he was steadily running out of room. Between him and the still swelling demon behind him, the room would not last much longer.
Unless ......
Quickly, Coal tried to remember what he had learned from his classes. There was a spell that allowed the caster to manipulate the size of an object (or series of objects) to the amount of the caster's choosing. It was a surprisingly simple verbal incantation, given its vast applications.
Coal thought about the room as he spoke the incantation. He thought about how he wished for it to grow and / or shrink with Xan's body. After a couple of moments, the incantation activated.