Thread by @Iracebeth3

cw// nsfw, dubcon, a/b/o, tentacles, anal

The thing is, Fatgum has to start with Tamaki.

By the time he realizes what's going on, it's too late — his boys are already hot and bothered and antsy and wet. Even Tetsu, a beta, is a blushing panting mess. Kirishima is so wet+

https://twitter.com/MonsterMomma7/status/1376009427711627264

his slick is leaving a stain on his pants, his expression tortured. Compared to that, Tamaki seems better put together. He's blushing and panting, but he seems to have some werewithal at least. When their eyes cross, he seems to be /there/.

So Fat grabs his neck and brings him closer, feeling him squirm on his hand. His scent is sweet and inviting; the slightest twinge of fear completely overtaken by /want/.

Licking his lips, Fat throws him into the bed. He can hear him gasp and whimper; can hear Tetsu and Kirishima blubber desperately, and he does what he can with his scent to calm him down, but it's hard to focus on them — on anything other than the promise of that hole waiting+

for his cock.

He rips off the seams of Tamaki's pants, making a mental note of getting him new ones later. Tamaki moans, spreading his legs open wider; his mouth hanging open with a stream of "pleases" and "quick" cut short by gasps.

Fatgum runs his thumb over the swollen red lips of Tamaki's pussy, so moist and soft to his touch. The boy quivers and moans, covering his face with slender arms.

Fat ligns his cock up with Tamaki's hole. And then he pushes in.

It's wonderful: tight and warm, hugging his cock in the most delicious way. As an alpha prime, Fat is large, yet somehow, the boy takes him: his cute slick pussy opens for him with little to no resistance, letting+

Fatgum's cock fill him to the brim. He tops out in one go, with a deep satisfied groan.

It's so tight. So fucking tight. He barely has any room to move. Drool streams down the two sides of the boy's mouth. He's so /full/ Fatgum can see the bulge of his own cock on+

the boy's belly.

The alpha licks his lips, thrusting slightly, just to see the boy squirm. Out of all his boys, Tamaki is the only one he was sure could have a possibility of making it — he's taken cock before, right? He's probably been fucking that childhood friend of his+

for years now. Which means he knows how to take cock — his body is used to it. It's all pleasure, no pain.

He doesn't have to be careful.

With that in mind, he tips off whatever remnant of the boy's pants to raise his legs to his shoulders and then thrust once, and again, and again, and again. He takes his cock out, until the tip is barely grazing the surface of the lips, and then he slams in. Again and again and+

again and /oh fuck-/

The boy moans and screams with each thrust. Fat feels him come around him, his pussy squeezing him so tight he's almost milking him. But Fat keeps thrusting, even as the boy's moans become sobs, chasing his own release.

He comes with a loud groan, the boy wailing and shaking under him. Fat has to close his own hand around his knot and press around it.

He can't knot him. Not that he think he couldn't take it — his boy can certainly take that and more. But he's not his only boy.

Fat looks to the side. Tetsu and Kirishima are giving them avid, hungry looks. They're still kneeling right where they left them, but they are having a hard time staying still — they are red and panting, drooling openly at the sight. While they haven't shifted+

position, their hands have found their way into the other's pants. With some of the edge off, he should be able to take care of them.

Fat whispers instructions on Tamaki's ears. He sees the teen pout, mumble something about how cruel it is that he won't let him sleep, but Fat+

stays firm and, eventually, Tamaki relents. He drags his feet towards Tetsu, while Fat centers all of his attention on Kirishima.

The poor boy doesn't seem to know what to do with himself. He wants so much, and it's so hard to be good and stay. He sighs in relief when Fat picks+

him up, carrying him to bed in his thick arms.

With Kiri, Fat takes his time. He places him on bed and peels off his clothes slowly, getting rid of the layers of fabric one by one. His scent is so sweet — untouched. It makes Fat licks his lips.

With Kiri, Fat takes his time. He places him on bed and peels off his clothes slowly, getting rid of the layers of fabric one by one. His scent is so sweet — untouched. It makes Fat licks his lips.

He gives a long lazy lick to Kiri's pink pussy, and then another. The boy squirms and moans, eager, calling him "alpha" and begging for more. Fat circles his tongue on the boy's clit and licks deeper, pushing his tongue in that sweet little hole.

Oh, those moans. The boy screams as if there was no tomorrow, his hands flying to Fat's head trying to move him around, but Fat stays still — he holds the boy's hips and eats him out to /his/ heart's content, savoring every drop of slick as if it was his last meal.

The boy comes once in his mouth, more slick oozing off his little hungry hole like a damn waterfall.

At some point, Fatgum pushed a finger inside of him. It's longer, and at least twice as thick as one of Kirishima's fingers. And it's only one.

He's so wet Fat has no problem pushing a second finger, and then a third. Fat takes every finger in and out slowly, wanting the boy to get used to the size. Once Kirishima is panting and impaling himself on his fingers, Fat figures he's ready for the final act.

The second the tip spreads his folds open, Kirishima screams. He keeps screaming as more and more of that thick cock opens him up. Fat is halfway through when the wailing gets higher. And then the boy breaks into sobs.

The man grits his teeth and stops, frustrated. His alpha wants him to sink deeper. /He's an omega, he can take it-/

But a single look at the boy's face tells him he'll be needing more time... So he pauses to catch his breath, his eyes fixed on the omega, his forehead+

covered in sweat from the effort of holding himself back.

Little by little, Kiri calms down. The pressure around Fat's cock becomes bearable. He rubs his thumbs on slow, gentle circles on the boy's hips, trying to get him to relax further.

"It's okay, boy," he whispers, his voice raspy and rough, "you can take it."

He gives a slow, tentative thrust, testing the boy's reaction. Kirishima frowns, but his mouth opens in a silent moan.

So Fat thrusts again, and again; always slow shallow thrusts, trying to let the boy's body get used to the size. It seems a hopeless task — Kiri screams and whines and shivers, panting slightly. The length is too long and thick; he's never taken anything this big before. It's+

a delicious torture; pain and pleasure mixing together. He comes again, hard, between panting and shaking. Tears stream down his face freely, leaving faint traces in his red cheeks and dark stains on the sheets below him.

Fatgum coos at the sight, a gentle smile flourishing in his face. He rubs the boy's belly first, and then his cute boy cock. He seems to shake harder at the touch, but he doesn't try to get away. He takes it, trusting him.

So Fatgum makes what's left quick. He keeps his thrusts short, but they speed up. When he's about to come, he pulls out, coming all over the boy — his cute cock, his belly and his chest. A few drops reach his face, mixing up with the tears on his cheeks.

It'll be a pity when he cleans him up later. For now, however, he'll leave him like that. The boy doesn't seem to mind. He seems about ready to fall asleep, so thoroughly ruined he can't seem to mind anything else.

Fatgum knows he'll fuck him again. Before his rut ends, he'll sink himself in that tight heat to the base. He'll knot him, too, just so the boy knows what it feels like to be thoroughly and truly full.

But he has to take care of his last boy first.

A few meters away, Tetsu is on wll fours on the carpet, completely naked. A thick tentacle works him open slowly, moving in an out of him in a slow but relentless rhythm.

Fat takes a moment to look at Tamaki's work. Being a beta, Tetsu's body is just not meant to take an alpha prime's cock — it could rip him off if he's not careful. In the middle of a rut, and still without having been able to knot anything, he wasn't sure how /careful/ would+

he manage to be.

But Tamaki made an excellent job. Tetsu's hole is gaping open, taking the tentacle with lewd wet squelching. The boy moans and groans relentlessly, his hands making fists on the fabric of the carpet.

He's on the verge of tears, too. Coming closer, Fatgum notices Tamaki manifested a second tentacle — a thin appendage that curls around Tetsu's cock, preventing him from coming.

"You're clever, aren't cha?" Fat says, petting Tamaki's hair, "that way he won't be coming."

Tamaki doesn't look up from Tetsu, but his pointy ears go red. He straightens his back slightly, leaving Fatgum space to look.

"H-he's close already," Tamaki mumbles, "I wanted to-"

"To keep him for me?"

Tamaki doesn't say anything; he just nods. Fat chuckles+

softly, burying a massive hand on the strands of black hair.

"Good boy."

Tamaki's ears go redder, and Fat wonders whether he's just stumbled upon something good. He'll have to explore that later.

Now he has to take care of Tetsu.

The boy whimpers when the tentacle leaves him; his hole clenching on nothing. Fat's scent is washing over him again, making him shiver with /want/.

Fatgum picks him up with firm hands and then sits at the edge of his king-size bed. In front of them, there is a full body mirror.

Tetsu doesn't seem to be aware of what's happening. His jaw is hanging open, his body slack. But then he finds himself in the mirror. Like a dream, he sees his own body, covered in hickeys and bruises from Amajiki-senpai's+

"foreplay." He sees Fat'd hands holding his thighs, so huge sees the massive length about to impale him and his own cock; red and begging for release, and then he sees that huge length about to impale him.

He sees how it enters him — how that huge cock pushes between+

his buttocks and /in/. And he can feel it; too hot and too big and /too much/-

But the face that looks back at him in the mirror shows no pain. The mouth hangs open in a moan, his body chest goes even redder; his erection throbs.

Somehow, Tetsu finds himself begging for more. He can hear Fat laughing at his back. But he relents — he moves Tetsu's body so easily, like a toy doll. And his cock fills him so much, so huge, so full and /thick/ and fuckfuckFUCK-

Tetsu comes hard, white pleasure blinding him for a second. He screams harder when Fatgum keeps moving him — sees his own face twisted in pleasure and pain and his own stubborn cock going hard against his stomach again. Fat uses him to his heart's content, like+

a toy, and Tetsu had never felt so well — so special and /useful/.

He barely realizes when Fat comes; his mind way too far off for him to care about anything; but the sight of white cum covering that thick cock is unmistakable.

It still feels like a dream when Fat pulls his cock out- or, rather, pulls /him/ out, like the world's biggest rut toy.

Fat hugs him against his chest, then, leaving a tender kiss on the back of his head. He mumbles "well done," and it almost makes Tetsu purr.

Fatgum places him on the bed, carefully arranging his body. He sees Tetsu search for Kirishima's body — sees how their hands find each other and squeeze. And he watches how the two boys fall asleep.

His cock throbs. It's the complicated part about having multiple+

rut partners. He couldn't exactly knot all of them at once... And he couldn't leave them waiting, either. But the fever wouldn't die down until he popped in a knot.

The good thing, though, is that he has three boys. Not one, or two, but three.

He finds Tamaki in the bathroom, masturbating.

It's mesmerizing, in a way, to watch him work tentacles in and out of him. Even without knowing he's being watched, Tamaki keeps his moans low — little noises ushered through clenched teeth; so pretty they make Fat want+

to push his cock down his throat, just to see what sounds would he make then.

Instead, he adds in a finger to the boy's hole, making him moan. He spreads him open in his fingers, and then his tongue. He knots him, his mouth singing praises about his performance: how+

good he is; how well he prepped Tetsu for him and how tight and sweet his hole is; how he wishes he could keep them all around his cock forever.

Tamaki melts at the praise, moaning louder every time, until he's downright screaming at every thrust. He hits the wall+

when Fat knots him, so hard it leaves a mark on the wall.

Since they're already in the shower, Fatgum cleans them off a bit before leaving. A short hot shower and a towel later, he's climbing back to bed, Tamaki's body still limp on his knot.

The last of his boys joins the others drifting off to sleep, and Fatgum looks at the three of them for a few seconds, his cock throbbing.

He could get used to this.

(~end)

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This was all written with express permission of @/MonsterMomma7 UwU)

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