Frisk and his goopy friends

Frisk was fast asleep and lost in post-party slumber, his senses deprived by devious applications of alcohol. So as the strange, slender amalgam appeared in his room, its iridescent white surface almost glowing in the moonlight, he did not shift an inch in his deep sleep. After a few moments, a long, rounded tendril poured forth from that featureless standing shaft of pure white. It snaked its way through the air to the disheveled unconscious human, the tip glowing in the moonlight, slowly advancing on its victim.

Then with a single thrust it gripped tight the wrinkled kicked-aside blanket and pulled it up Frisk’s sleeping form, tucking him in gently and ruffling his hair innocently. An air of peaceful contentment filled the room, and the innocent iridescent being faded from sight, leaving Frisk to his catatonic and quite comfortable slumber.

But that’s not the conclusion the audience wanted, and by some cosmic psychic interference, things began to mechanically swerve to a different path.

Appearing again, the pole-like amalgam swayed slightly, as though drunk or agitated. Its rounded bulb of a head angled towards the human, the white face unreadable and featureless. Out from its body sprouted a long iridescent tendril, arcing downwards to gently brush against Frisk’s lips, dragging his mouth briefly open before the supple flesh shifted back into place. The tendril itself began to engorge, gaining a formidable thickness, the tip glistening slightly with moisture. A single bead of transparent fluid formed at the conical tip.
One again the probing tip pressed to Frisk’s mouth, this time entering the warm orifice gently, a quick spurt coating the inside of his mouth with the viscous fluid. Compulsively he swallowed the lukewarm load, and even swept up in drunken dreams his face flushed red rapidly.

By simple chanced lurid dreams or perhaps that mysterious secretion, the lithe human began to toss and kick in his bed, the sheets shifting from his supine form. He still wore the clothing from the party: his signature blue sweater long having been changed from the multiple stripes of childhood to the single vertical stripe of adulthood. Like his sheets it lay disheveled on his body, much of the smooth expanse of his stomach exposed to the air, his trousers shifted partly down his hips, a tuft of dark hair peeking out from his waistband.

The amalgam stood with unknowable intention, its bulbous face immaculate. The singular extended limb bulged again, and split down the middle, forming two stalk-like protuberances, glistening with that same slickness, strands of the stuff briefly connecting the two appendages. The long and girthy tendrils slowly crept their way down, sliding along the human’s bare belly, trails of glistening wetness in their wake as they slipped silently inside his trousers. The twin tentacles quickly found Frisk’s limp cock, and worked their way around it, one slowly stroking the length of his shaft while the other gently teased his balls. Within a few seconds the human’s member began to throb with DETERMINATION, extending its full length within the cloth confines of his pants.

The tendril coiling around the human’s balls extended, trailing down his taint to the plush confines of his rear. It probed gently against his tight hole, the dual stimulation causing the human to let out strained sounds in his sleep, gently shifting his body with the teasing ministration of the monster above him. The slick tip of the white appendage suddenly shifted, the tapered tip slipping abruptly inside Frisk’s rear, making him moan quietly.

The amalgamate went stock still at the sound, and only after a few long moments resumed its comatose coitus. The limb penetrating Frisk’s rear drove itself inexorably further, coiling within, to cause the most stimulation, and the one wrapped around the human’s throbbing cock began to slither in a spiral along its length, the tip gently teasing his cockhead. In moments, a hot slick of pre had formed, darkening the front of his trousers. The human’s whole body was shuddering, his hands gripping the sheets as his hips bucked.

The amalgam redoubled its efforts, pistons and stroking in tandem to bring the human to the brink. Thick translucent slime backwashed out of Frisk’s ass as he was ravaged. Suddenly the human’s eyes fluttered open as he awoke to breathless orgasm, his cum arcing along the interior of his underwear, cascading down his thighs, both tendrils pulling away with a lurid sucking sound as the molesting monster vanished from sight. The human panted in the afterglow, his cock and ass throbbing simultaneously, remnants of that clear fluid the only proof of something outside of the amazing dream he’d been having.

After he stopped twitching from the sensory overload and the afterglow faded into a warm fatigue, the human drifted back to sleep, his pants soaked with semen.

-

In the morning he woke shocked at the mess he’d made, and quickly cleaned up, switching out his clothes for identical, but much cleaner clothes.

After a quick breakfast he took off to handle his day’s chore. Alphys and Undyne were going to some sort of weeb convention, and many of the dogs had taken to playing poker, so it befell the human to care for that slobbering wonderful monstrosity Endogeny.

Frisk collected the bouncing amorphous hound and at first attempted to collar it, but couldn’t figure out how, the collar sinking first into and then through the goopy surface of the beast. After several frustrated minutes he gave up, and simply walked along, whistling every time the congealed collection of dogs became distracted.

Soon enough the human and the shambling, shuffling horror were back at Frisk’s place. He was unsure about what exactly to do with the dog now that he’d brought it there. Maybe they’d watch TV.

Searching the couch for the remove, Frisk turned back and felt a pang of annoyance as he saw the missing device sinking into Endogeny’s side, lost and never to be found again. His face a mask of complete inexpression at this absurdity, Frisk stood up and made for the kitchen, hoping to maybe allay his boredom with cooking. But the instant his foot landed on the cool tiles, his whole being seemed to lurch, a dizzying, hot sensation spreading through the core of his being until his head swam drunkenly.

He stumbled and gripped the countertop as his bowels clenched, something warm and runny trickling out of his rear. And despite that, his groin beginning to throb and his heartbeat pulsed loudly in his ears.

Reaching a shy trembling hand back, he felt the dampness spreading across his pants. Holding his hand in front of him he rubbed his fingers together, feeling the slick, viscous fluid that was leaking out of him. He sniffed it and nearly fell over. The heady, strange aroma made his head swim, and he found himself bracing himself slouched over the counter like a drunk, his body burning with some intimate desire. His hand unconsciously gripped his groin, massaging his crotch through his pants, not caring if he had to burn them afterwards.
But suddenly a sound broke him out of his self-interest. Sniffing the air with weird wet sounds behind him was Endogeny. The goo-hound was nearly on top of him, it’s inky-black face pressed into Frisk’s rear, huffing in whatever scent was currently leaking out of the lust-addled human. Hooked claws emerged from two dripping forepaws and all but tore down Frisk’s pants. Without pausing for an instant, the oozing canine pressed its dark sloppy snoot between the human’s slick buttocks, its tongue thick and constantly reshaping, stimulating Frisk’s ass like some lumpy self-lubricating vibrator as is lapped along his taint and pressed to his well-lubed hole.

He groaned loudly as the inky-dark probing organ slipped inside, flailing mercilessly within him, the whole of it expanding and coating his insides in dark slobber, his prostate battered by vibrations. In moments he felt he was being driven to the edge, his cock oozing a Niagaran amount of pre to fall onto the tiles. For a brief moment, he struggled against the dog’s affection’s, trying half-heartedly to push Endogeny back. But a low growl rumbled through his read and pushed him over the threshold. His cock bobbed in helpless sensation, his balls drawing up against his groin as spurt after spurt of creamy release splattered against the side of the counter and the human collapsed again, drooped over the counter.

Endogeny withdrew its face from the human’s rear, the ivory tongue pulling free in a wash of dark frothy spittle that oozed down to drip off of Frisk’s hairless ball sack. Frisk began to push himself away from the counter, his body shaking weakly.

Suddenly two enormous pawed limbs dripping white sludge slammed on either side of his shoulders. Frisk pressed back and felt the full soft form of the amalgam dog pressing back at him, and something long, thick and bot pressing itself up between his legs.

Looking down with a sluggish, fever-addled gaze, the human’s eye’s bulged at the sight of Endogeny’s cock pressing upwards against his own still-hard member. It was easily double the length, its black surface glistening in the light, veins of pure white spiderwebbing its surface, the heat radiating off it surging up through Frisk’s groin, making him reflexively flex his cock, a fresh bead of pre oozing out onto the hounds throbbing member. The amalgam’s hips drew back, and its cock aligned its black rocket with frisk’s somewhat agape asshole. A moment of fear and resistance flashed through Frisk, and he contemplated thrashing madly against the dog.

But his sense of DETERMINATION overcame that fleeting madness. He wanted that bad boy inside him.

Perhaps sensing Frisk’s submission or cooperation, Endogeny pressed forward, the slick, burning hot erection of affection plunging inside of the human, the enormous bulge of its knot the only thing preventing full insertion. The initial thrust drove the air from Frisk’s lungs in a strange sound that made his face flush hot as iron. After a few seconds of adjustment from both parties, the amalgam drew back, every viscous lump and vein and shifting mass of its cock dragging divinely on Frisk’s hot interior, making his whole body twitch erratically, his hands clawing the smooth surface of the counter as his cock dripped like a faucet, his legs shaking violently beneath him. As the monstrosity fucked him, extra limbs emerged from its form to brace his body, claws affectionately drawing red lines across his skin.
With every thrust, thick globules of precum and spittle and that unidentified slime were forced out of Frisk around that enormous black and white cock. Frisk’s own member bobbed weakly as he was brought to orgasm after orgasm, his eyes rolling back in his head as his cock emitted weaker and weaker spurts, eventually resigning to a weak constant trickle of translucent cum that dripped to the floor in a puddle. Endogeny’s thrusts became more intense and frantic, rocking the counter with every plunge inside of Frisk’s manhole. The human began to feel as though he were to faint, his legs finally giving way. As he fell the limbs around him tightened and held him, rotating his entire body, even as that monstrous monster cock pounded his backside with abandon. Endogeny’s whole body now draped over Frisk’s front, and he felt within the goopy mask all manner of sensations. Tongues grazing his skin while teeth nipped playfully at sensitive flesh, paws gripped and stroked his cock as lips sucked onto him and the whole of the thing some amazing contradiction of fucking and being fucked and it all drove the human beyond any sort of logic and into the realms of true mad sex. The final straw was the gargantuan knot popping inside of him, displacing his mind into a blank white fog of pleasure, his whole body bucking against the amalgam’s, his hands knotted in its tar-like hide as it unloaded shot after shot of pure DETERMINATION inside of him.

The whole quivering mass of flesh and sex collapsed at once, dragging the human to the floor beneath Endogeny. The sensations on Frisk’s skin did not cease, and as he was tied there by that doggy dong he still felt the pricks of teeth and claw and gentle laps of tongues and affectionate kisses. The whole of him in a warm and ethereal afterglow, disturbed only by the odd shift of the knot within him.
After a few more hours of wringing out gentle orgasms and increasingly urgent tugging, the amalgam pulled free, his knot popping from Frisk in a loud and lurid sound, the wash of monster cum threatening to flood the kitchen. Frisk lay there in a pool of their combined affection as the dog monster lapped at his face, and after a time he stood up and began to clean up. He found the remote in that puddle of cum and Endogeny gave him a most contented borf indeed.