"Yeah, Lucas, but your cock's bigger than mine. In fact, it's so big, I can fuck it like a pussy! You love it when I pummel your urethra like a fat onahole."
Lucas groaned as his 7 inches extended out into an enormous 2'6 mountain of fuck meat. Suddenly, instead of rubbing his cock over Derek, Lucas was now timing his thrusts with Derek as he pounded his smaller dick into the urethra of Lucas' mammoth cock. "Hhh, you're right," Lucas moaned through gritted teeth. "God, I love it when you do this, but it hurts so much~"
"No, it doesn't," Derek corrected. "It feels absolutely amazing. You can't imagine anything better than the feeling of getting your penis stretched by my monster cock. Your cock even excretes pheromones and lubricant that make it divine to fuck, and your cock is muscular enough to squeeze and milk another's dick better than a tight pornstar's pussy."
Derek was swept away in the feeling as the pleasure of fucking Lucas exploded. Every inch of his cock was milked by strong muscle, dexterous enough to keep him on the edge for hours, with a silky smooth inside that made sure there was nothing rough or sore about the experience at all. All he could do was grip Lucas as the man slammed his manhood harder down onto Derek's foot-long meat. He could feel his control slipping again as his mind was overcome with absolute pleasure. But who cared? This was the best fuck he'd ever had, why not go the whole hog and make it perfect?
Derek had made himself more muscular than Lucas, but with their 5-inch difference in height, it meant that it was all compressed onto his 5'5 frame. He was a lot stronger than Lucas. But now, Derek's fantasy had changed, and he wanted to still be big, but have a much bigger man slam him down into that heavenly cock over and over again. He wanted to be dominated.
"Fuuuck, Lucas, you're- so much more muscular than me! And those muscles, ungh, they're practically indestructible, denser than tungsten, and ten times stronger than they look. Ohhh, don't they just look so strong and powerful, but - ooooh - you still have superhuman flexibility. I loooove how you can just throw - oh god, harder! - me around. You're so tall, too, like 7- no 8 feet tall! I fucking love you, Lucas, I love it when you - ohhhh, yes, yes - dominate me!"
Derek gasped as a hand snaked around his waist. Only one was needed to grip the smaller man, and Derek was caught in a vice-like grip of warm stone as his body was effortlessly used like a toy. There was no give to Lucas' muscles - they were far too dense and strong for anything to even budge them an inch - but they still rippled with dangerous ease. As Derek's body was thrust again and again into Lucas' huge, 3-foot cock, he looked up at the giant above.
What a sight to behold. Lucas' face, molded in vicious lust, sat atop a veritable mountain of muscle. It should have been impossible - with shoulders the size of boulders, arms as thick as oil tankers, calves the size of tree trunks - yet Lucas pulled it off. Each glistening muscle rubbed against each other, yet never hindered his movement a bit, though the sound of his impossibly dense body just brushing against itself sounded like stones cracking against each other, or an industrial grinder. The huge man roared as he manipulated every muscle with ease, and used that control to tease and clamp down tight onto Derek's cock with his own monstrous member. Derek squeaked at the sudden and intense sensation.
Lucas smirked. "You like that, little man? You like it when I play rough with you?"
"Guhhh, yes Daddy!" Derek couldn't help but cry, not noticing as Lucas' features became more like his, and his face morphed into that of an older man. Lucas, now literally Derek's father grinned.
"Yeah, look at you. Small-" he slapped Derek's ass so hard he cried "-weak-" he pinched his nipples, making the smaller man moan in pleasure "-pitiful!" He slammed him down into his shaft again, this time swallowing his whole cock and balls into the strong, thick walls of his manhood. Derek was trapped there by the super strong muscles just in Lucas' cock, unable to move. "You're nothing compared to me. I fucking own you."
"Yes, I belong to you!" Derek cried. "I'm all yours!
Lucas leaned in close, pulling Derek's hair. "You're daddy's little slut, aren't you?"
"Yes Daddy, I'm your slut!" He writhed into the huge cock, and felt his whole body being groped and explored by immense, strong hands. They lingered on his soft, plushy bubble-butt, and traced over his tramp stamp. Derek was too addled with lust to even notice the change. All he knew was that Lucas was toying with him and that he really needed release. "Pleeeease, Daddy ~! Let me cum?"
"Alright, you've been good for me today, slut. You may cum." Lucas loosened his shaft's grip on Derek's cock, and the smaller hunk couldn't hold back. Unloading an amount of cum that would make a normal woman's pussy overflow, he dumped his seed into his father's immense balls. It was pitiful compared to the amount of semen that Lucas produced, and the massive man rumbled out a laugh.
"Let me show you what a real man's load looks like."
His cock clenched hard around Derek's dick, forming an unbreakable seal. He groaned, and suddenly spurts of cum raced down his dick, but, unable to escape, they were forced into Derek's shaft and balls. Lucas came with the pressure of a firehose, and Derek screamed as gallons of sperm rushed in and painfully stretched his balls to their limits. By the time Lucas was done, Derek had testicles the size of yoga balls, stretched, sore, and swollen beyond belief. Lucas smirked and finally released him. "Remember, you are truly nothing compared to me."
"Yes, Daddy," Derek whimpered as his father placed him down on the ground. It hurt to move. With the post-nut clarity kicking in, he realized just how far he'd gone, and how much he'd fucked up in the process. He needed to fix something. Now.