Coal barely had to tilt his head down at all, his raging hard on had grown so large. In fact, as his lips parted over his own, massively swollen tip, he found it hard to force it all in! His hands went to his long, turgid shaft and began stroking it as he tasted more fluid pump into his mouth from his balls, below.
His balls, below.
He could watch them as they continued to swell, looking down the length of his huge shaft. Each of his orbs had reddened to a dark, dusky color, like that of some of the daemonic pictures he'd seen in text books. In fact, his cock had taken on some of Xan's coloration...
Moaning, he continued to suckle himself, panting as he tasted his spunk, churning up from the massive balls he saw below ... each one well past the size of an over-large grapefruit, and still expanding.
Another shot of demon seed forced its way into his mouth, and he moaned, tasting his rich cum (his cock didn't seem to bother with precum, now) as he forced his tip to the back of his throat. Small dribbles of his seed seeped from around his lips as a bit of it escaped. He moaned, sucking more and more while his balls continued to grow...
Soon, each one was nearly a foot across and he could feel them churning. It was powerful ... potent. Closing his eyes, Coal didn't even hear Xan's repeated comments and jibes about his growing testicles. Rather, he just lost himself in feelings of sexual lust.
Soon, he felt his cock thicken suddenly and his climax erupted from deep between his legs. His throat was clogged almost instantly by his hot, sweet demon cum, his eyes flying open as he was forced to swallow it all or drown, gagging!
The seed filled him; flooded him and made him feel full ... over-full. He groaned and kept cumming, drinking and swallowing. The potion he'd drunk probably had something to do with it ... allowing him to survive the sexual onslaught. Groaning, he began to pant as his orgasm continued for minute after minute, his demon cock slowly spending itself over time.
A wave of energy swept through Coal and he could vaguely hear Xan's gasp of astonishment. Blinking, he opened his eyes as his orgasm faded and his giant balls stopped sending cum into his mouth.