Xan's hands continue to explore his new form, grasping his thickened pecs, sliding over that line of eight full abs, and moving down to explore his length. Even when he was small, Xan's shaft had been an impressive length, almost eight inches to scale. Now, he had grown to a human size, and his length had grown from an impressive eight to an obscene fourteen feet of pure, potent length.
Somewhere in Coal's mind, he knows something's off. Xan's supposed to be an imp, one of the weakest demonic creatures around. Now, his sheer strength had to put him higher up the hierarchy, and his virility made him more tempting than any incubus he had ever heard of. Could he still kept the imp bound? Would his familiar feel subservient?
The question soon becomes moot as the imp pushes on against him, lips meeting lips, tongue forcing his way into his mouth. He gasps before his shaft stiffens again, his overactive balls fueled by the raw lust imbued in their kiss. He gasps for breath as his own thick chest receives the demon's attention, two warm, firm fingers twisting and coaxing a reaction out from the human. "Gah... X-xan..."
"You made me this way, master." The imp's mouth loosens from Coal's, slipping down his body, sliding over every pumped, thick, and sweaty inch of his flesh. "Gave me this much power. I'll repay you in kind."
"F-fuck, Xan, what are you-" With a strength beyond even his immense, bulky frame, Xan lifts Coal up and tosses him back, the human landing on his back, his shaft rising towards the ceiling, lurching out a smattering of pre. The demon jumps right on, the bed creaking from the sheer mass of the two. But though Xan's mouth makes its way right along Coal's abs and his tongue twists around his shaft, the demon's own monumental length slides right up against Coal's face, before pumping right into his mouth. "Mmmph!"
"Your altered seed did this to us, master. Your pale imitation of a demon's power did this. Can you imagine what a true demon's seed will do?"
Coal's eyes widen as Xanadar begins to thrust in, more cock than humanly possible forcing its way into Coal's mouth, thrusting and jamming in every open space, aiming right for his throat. He can barely move, barely react to the monstrous meat, but every twitch, every motion sends a shiver of pleasure right through Xanadar's frame. The demon's mouth opens wide, stretching out to embrace Coal's tip, his tongue twisting along, shifting and embracing the head of his cock, even twisting in enough to nudge into his slit. Coal's body thrashes and pushes up against his pet's, their muscles forced against one another, squeezing and fighting for space.
It's impossible for the human to resist the full temptation of Xanadar's wiles. Coal blows again, a second load shooting through Xanadar's throat, his body responding in kind, pound after pound of pure power pushing onto his frame, his arms grasping tighter around Coal's body, his pecs pushing down over Coal's abs, his weight sinking deeper and deeper, his shaft gagging more of Coal's throat. Three hundred and fifty pounds of virile mass soon pump up to four hundred, four hundred and fifty. His head stretches taller, his features deepening, his tricky expression coated in deep, smooth, handsome features. His horns push out, his back spreads, and his build continues to pack on more and more. But the demon refuses to relent, continuing to drain his master for every drop of seed he has, mouth tight around his length and refusing to let a single drop slip away. But even as Coal puts out the last few droplets, the demon's load builds, a pair of heavy, overloaded balls pushing against the human's face, his load rumbling as every fiber of the creature's being prepares himself for a pleasure unlike any even an otherworldy being has experienced.
The demon roars, the sound forcing its way through Coal's shaft and along his body. There's no room for air, for anything, as the demon shoots, a flood of seed flowing right into Coal's body. But though he gags for the first few moments, the flood of power continues to flow in. The bed cracks in mere moments as his body reacts, meeting Xanadar's new size within the first shot, then exceeding it in the second. His chest and body fight for space as they push up against his familiar's mass, then bounce him upwards. A single thick arm works around and grasps him as five hundred pounds of mass continue to milk the demon for more, a thick hand grasping at his orbs, coaxing and twisting out even more. Coal's tired length soon refills and re-hardens, but the sudden swell surprises even Xan, a foot and a half of cock falling out, before swelling up to two feet of pure virility.
The bed gives in its entirety as the two fall to the floor, but the mattress alone loses all hope of containing the two. Coal's head continues to rise, his legs hanging from the side, his head nudging back against the wall as his thick body takes up any remaining space. With a hint of regret, he grasps Xanadar's shaft and pulls it out, the rest of the demon's heft lifted along with it.
"Master?" The demon groans as he's lifted up, his body tensed in preparation of the immense being before him. But even he's breathless as that creature in front rises. Eight hundred pounds of overwhelming mass pushes up, almost reaching the ceiling as he does. His incredible length remains ready, pointed up and aimed right at the demon. Coal looks down at himself, the shelf of his pecs blocking his view of his brick-like abs. Two arms hold an incredible, rounded mass, and his back presses in, brushing against the wall when he moves.
The human can only grin as he looks over just what the demon's wrought.