Asgore sat at the dressing table, wearily examining himself in the mirror. His cock was still semi-hard, lightly dripping cum onto the floor, and he could hear Asriel’s light breathing from the bed behind him. Asriel…

This had been the third time this month that he'd caught himself reflecting on this situation, and he was starting to grow a bit afraid. Having an attraction to your prepubescent son was certainly not normal. Yet… 

He sighed. He had to remember this wasn't for the “attraction”. He was doing this for important reasons. The humans wanted peace, peace in the form of his son's magnificently tight little ass. Asriel would need more training if he was going to fulfill his new role. H-his role as… As human fuckmeat…

But that's how it had to be, if the humans he had met with were correct. One look at his son had some of them salivating, almost. Apparently there was a great demand for young monster ass, a demand that only the Underground could fulfill.

It's not like he didn't love his son. He totally did! But the kid had nearly laid waste to his people. And he was honestly a bit of a brat. Less so now that he had been getting regular doses of daddycock down his throat, but still relatively annoying. The way he mewled and cried pathetically whenever he was fucked too hard, or his leash was too tight. Tori would never have complained; she used to live and breathe his cock. And look what that resulted in…

Peace with the humans was what was important now. And if the weird humans wanted his son as a well-trained whore, then he would deliver. He wanted what was best for everyone. And so he climbed back into bed and roused his sleeping son. “Morning, Azzy…”

“Mmmngh…” His precious little boy sat up, the blanket he was wrapped in falling down to reveal his slim, fluffy body. He hadn't been allowed to wear clothes for the past few months, only the collar with his name embroidered on it, as well as the cage. Asgore smiled at the sight of his son's tiny cock trapped in its shiny cage. It was kind of sad that his son would never experience an orgasm.

“Rise and shine. Gotta lot of work to do today…” Asgore kissed the boy's forehead. “Lot of meetings to take care of, but I'll be back soon enough…”

“Ah… O-okay…” Asriel blushed. His dad's beard and breath always tickled.

“I want you to be a good boy and go practice with that big toy I gave you…” Asgore murmured, running his hands down Asriel's soft chest. “I want to come back and see you using it proudly, okay?”

“Y-yes Daddy…”

“Good boy. Give me a kiss.”

They locked lips, and Asriel's mouth was immediately filled with his daddy’s hot slick tongue, swabbing the inside of his throat with dad spit. He swallowed obediently, moaning as his ass was groped hard. He'd be a good boy… H-he'd make Daddy happy. No punishments today…

He thought that every day, and every day there was a punishment.

His daddy grabbed his coat and his briefcase and headed out the door, locking it behind him. He'd forsaken the whole classical king look for a more business-oriented and professional look. Another result of meeting the humans. Asriel remembered having to sit between his father's legs and lick his crotch clean of sweat after a long day of work. The suits made him so sweaty, and Asgore never washed his cock or ass when bathing. That was the job of Asriel's tongue.

He shuddered a bit, thinking of his daddy's butt. His daddy had such a huge stinky ass that was always sweaty and never wiped… I-it was horrible… But… B-but he always got praised so well for cleaning his dad's asshole with his tongue. And the taste wasn't… It wasn't all that bad.

Well, he had about 8 hours before Daddy came back. That was a lot of dildo time. His butt already ached thinking of it.

The dildo in question was a very large and long horsecock, with a thick flare that made getting it in the most difficult part. Followed by the ring in the middle… Asriel had steadily been working his way up to and past that ring. He was supposed to be able to take the whole thing without effort by the end of the month. Two weeks.

He'd trained with many toys before, smaller ones with knots and such. Wearing butt plugs whenever he went out. But he rarely left the tower now, only when Daddy wanted to take him for a walk. And he was thoroughly plugged then.

After this horse dildo, the only thing to train with would be Daddy's dick… And then he'd be going to stay with some people, apparently. Asriel wondered what they'd be like. This was all being done for them, apparently.

The sudden urge to pee overwhelmed him, and he leapt out of bed and went to the bathroom, relieving himself in Asgore's toilet. It already stank with his dad's piss from earlier; only Asgore was allowed to flush the toilet, and he rarely did.

The other thing about the toilet was that it was the only thing Asriel had to drink from. He'd had it beat into him pretty well: little boys drink from toilets, no matter what is in them. But doing so always made him blush and feel a bit queasy. The bathroom sink was too small for him to try to drink from, and the bath water only worked with magic. It was either toilet water or his dad's piss, cum, and spit. Asriel was always thankful for when the toilet was clear.

After emptying his bladder, he knelt down and shoved his face in the lukewarm water, noisily lapping up the gross mixture of father-son urine. ...It tasted a lot better when mixed like this, in Asriel's opinion. Despite only having his dad's disgusting yellow piss to drink, he himself was always fairly hydrated. And he liked the taste of pee.

Would the people he'd be staying with have yummy pee? He hoped so.

After drinking his fill of putrid goat urine like some kind of stupid animal, he returned to the bedroom and thought about what to do next. There was the cum bucket in the corner, for emptying his butt whenever it was full of Daddy's cum. It was empty now though, just like his butt.

There was the laptop. It was for Asriel to watch and study videos of other little boys having fun with their daddies, or random people, or animals. Asriel loved pleasuring animals, but it had been a while since he'd last done that.

He retrieved the heavy horse dildo from its drawer and put on his favorite video of a young boy getting humped really hard by a big dog, so hard that it made him scream. Asriel groaned as he worked the giant shaft into his butt, thinking about how lucky that boy must've been. Daddy told him boys always screamed the loudest when they were happy.

...And he wanted to be happy. H-he WAS happy. He grimaced as the thick dildo invaded his insides, giving him a very full feeling. This was the only other thing besides Daddy that made him feel full from his butt.

He WAS happy, he thought, as he watched the kid on the screen get raped over and over by the huge Rottweiler. He was making Daddy happy, having lots of fun. Feeling good.

He remembered sometimes that he used to have friends, and that he used to go outside a lot. Now outside was just the castle garden, always held close to Daddy thanks to the leash. Now his best friends were this dildo. The toilet. Daddy's big cock.

The screams of the boy in the video were ingrained in his head. He wanted to scream like that. He tried to scream like that whenever Asgore raped the holy fuck out of him, coming home and fucking his ass raw until it bled. Each thrust eliminated any thoughts or will he had, though, reducing him to a whirlwind of pain and pleasure. When Daddy fucked him, it was like he was just his own butt. All he felt was cock sliding in and out of him, stirring up his insides.

His insides were about to get stirred up now… He pushed back into the dildo, gasping as it filled him up and spread his hole so wide. It was a feeling he didn't think he'd ever get used to, no matter how much dick he took.

The video he was watching eventually ended, with the kid left a sad blubbering mess after having the big dog knot him. Asriel watched it a few more times with intense interest before switching to something else. A video of a kid getting peed on and then fucked in the face. He loved the sounds people made when they were choking on cock. He'd asked his dad to copy the video and do this to him, and ended up passing out from the lack of air.

The day proceeded rather uneventfully, and Asriel completely lost himself to butt-stretching pleasure, working more and more of the fake horsecock in until he was almost ¾ there. Daddy would be so proud to see this.

And indeed, when Asgore walked in that evening, he beamed at the sight of his son on the floor, desperately pushing more fake cock into his ass. “Ahh, look at you go! You're getting there, huh?”

“D-daddy…” Asriel whined. “I want m-more…”

“Hmm… It's natural for a boy to want to be as full of dick as he possibly can. But there's no rush. You're doing perfectly fine.” Asgore reassured his son as he undressed, peeling off his heavy suit and dress shirt. Today had been particularly exhausting, and his dirty kidthirsty cock was begging for something to fuck silly. He was angry, too… Humans were so fucking stupid. He'd ignored their stupid drivel all day and had been thinking about raping Asriel.

He turned his attention to the laptop he'd given Asriel. It was only able to play a large collection of vestiality and pedo rape videos, given to him by Asriel's buyers. The perfect excuse to start some trouble. “What's that you've got going there?”

“I-it's, uh, this video of a guy teaching this boy how to suck a horse…” Asriel panted.

“Really? Hmm…” He was soon down to just his underwear and socks, and he went and knelt beside his little fucktoy. “That's nice and all, but I don't remember giving you permission to watch videos today.”

The fear that suddenly overwhelmed Asriel was indescribable. He very quickly sat up, the horse dildo flopping around underneath him. “A-ah…!”

“I wanted you to train your butt today, and you've done a good job of that it seems…. But…” Asgore reached over and closed the laptop, putting it into sleep mode. “But, there wasn't anything about watching videos. Right?”

“Um… N-no…”

“Hmm.” Asgore got up and went to the bathroom for a moment. The toilet was unflushed, and the piss in it was pretty low. He'd been thirsty today.

He returned to the quivering boy and sat down beside him, reaching down to yank the horse dildo out of his ass. It slid out very easily, with an almost comical pop and a cry, and Asgore held it up with one hand. “Well, let's practice something, then. You're gonna suck this horse cock!”

Asriel swallowed nervously. He'd never really sucked on it before… But he opened his mouth hesitantly. Asgore positioned it carefully and started sliding it down his throat, very quickly stretching it to its limit.

“Nnnggghh…. NNNNGHHCLLK!” Asriel started choking as his dad shoved the thing as far down as he could, giving a nice bulge to his son's throat. He grabbed his dad's arm and screamed, trying to pull away, but one hand was behind his head, holding him secure…

“Aww, you sound just like the boy in the video.” Asgore continued until the entire thing was in Asriel's mouth, the balls touching his chin. The boy did his best to breathe very very slowly, as he'd been taught, but it wasn't any use. Tears streamed down his face as he rapidly lost air, and the reflex to swallow made him choke more.

“MMMMMMMGGGCLK!” He cried out as Asgore pulled the dildo out and slammed it back in, rounding out his esophagus again and forcing his mouth open most painfully. S-sucking a horsecock was NOT fun!

“Alright, now listen to me. I'm glad you're enthusiastic about learning, but you know better than to do something you weren't told to do.” Asgore cooed in a warm, fatherly voice. Seeing Asriel struggle to breath and stay conscious was so fucking hot. “Trust me, the people you'll be staying with won't be nice like ol’ dad. You have to do everything to the T. Or you'll end up like this. Okay?”

Asriel did his best to nod, extremely dizzy from the lack of air and pain.

“Do you understand?”

Asriel nodded again, his eyes starting to roll back.

“What do you say, then?”

Asriel groaned and started choking more, trying to form the reply “I understand, Daddy”. Asgore held the dildo in place firmly, waiting patiently for a combination of grunts and chokes that sounded like those words before pulling the cock out. He tossed it aside and waited even more patiently for his son's pathetic coughs and gasps to subside, for color to return to his cheeks again.

The boy slowly crawled towards his dad, aiming to give an apologetic hug, but bleated in alarm as he was roughly grabbed by the scruff and pulled to his feet. Asgore turned and tossed him onto the bed, pulled his underwear off (finally freeing his eager pedocock) and climbed into bed after the boy.

Asriel had no time to turn over or really say anything before his dad's weight pressed against him, and that familiar bitch-breaking fucklog pressed against his ass. He whimpered and tried to adjust himself a bit to be comfortable, but it was too late. Daddy's whole weight was pressing him down, and soon that cock was shoving its way into his abused boypussy. Each thrust elicited nice screams and wails of apologies that Asgore happily ignored. He moved his hips faster, raping his stupid son into submission.

It was hard to believe such a regularly fucked boyslut could be so tight. His entrance was pretty loose, but the warm meat inside always gripped Asgore's cock perfectly. This was a real fuck. As much as he appreciated Toriel, her pussy was nothing compared to a little boy's ass. That thing was stretched sloppy from how much of a whore she was. But kids always stayed tight. Always tight and ready to bend over to get molested by thirsty fucksticks.

He really loved raping things, to be honest. It was so thrilling. It really made him feel like a king. And seeing his own son, his own seed pinned underneath him. Seeing his cock reduce his little toy to a blubbering mess.

Why, it was enough to make him cum already.

And cum.

And cum, and cum, and cum, and cum, until he finally pulled out of his son's gaping hole several hours later, feeling pretty spent. Asriel was on his back now, legs up, looking up at the ceiling with a dazed look.

“How'd you like that?* Asgore teased, patting his son's bulging stomach. Asgore's fat nuts sure loved cumming in this little fleshlight. It… Er, he, didn't respond. Only blinked slowly.

“Guess you're tired out, hmm? Well, we'll keep going in the morning.” He leaned down and kissed his son's soft lips, slick with drool. He then thoroughly wiped his cock on Asriel's belly fur, getting as much cum and blood off as he could before lying down and pulling the blanket over them. Asriel gave a shaky little sigh and suddenly leaned in close, pressing his face to his father's chest. He was in a complete daze. He was shaking very badly.

But the warm feeling in his butt. In his belly. And his daddy's fluffy chest…

“D-daddy?” Asriel whimpered.

“Yes?*

“I love you… L-lots…”

Asgore smiled. He was doing a good job after all! Good whores loved getting cockfucked into next week. “I love you too…”

Asriel smiled and huddled in close, drifting off to sleep as the pain in his ass slowly throbbed away. That was just a sign of Daddy's love, in the end. He'd been bad, but Daddy still loved him.

And he had made Daddy happy.