Breaking My Tsundere Sister Like a Filly and Filling Her Up♥
The pent-up lust of a long-neglected married woman was truly a terrifying thing.
I had lost count of how many times I had made her climax, yet she still hadn't passed out.

Pound!♥ Pound!♥ Pound!♥ Pound!♥
"Go on♥ Cum for me♥ Squirt and climax like the little female you are!♥"
"Ah♡ Ah♡ Ah♡ Ah♡ I'm cumming♡ I'm cumming again♡ I already came, so please let me rest just a little♡"
Squirrrrt!——♡
But in the end, she was nothing more than a female.
Before me, the most perfect being of all, she could do nothing but wail like a bitch in heat.
Rebecca was down on all fours before me like a beast.
With every thrust, her massive, heavy ass flattened against me, yet its elastic bounce pushed back against my body—a truly exquisite sensation.
Pound!♥ Pound!♥ Pound!♥ Pound!♥
"Ah♡ Ah♡ Ah♡ Ah♡ Stop it♡"
Smack!♥
"Ahhh!♡"
"Hehe♥ Look at you, a great Celestial, whimpering and moaning while your hair is pulled and your ass is thrashed♥"
I grabbed Rebecca's hair like a set of reins and slapped her incredibly tight, bouncy ass with the palm of my hand.
Her snow-white buttocks turned a vivid crimson, like blood splattered across a snowy field.
This wasn't the respect due to a Celestial; it was the rough handling of a thrashing mare.
"Y-you...!♡ No matter how far we go, there should be a limit—"
Smack!♥
"Haaahn?!♡"
A shiver of pure ecstasy ran through my entire body at the sheer sense of conquest—the knowledge that I was violating a being who ruled this world like the heavens themselves.
My cock, so hard it felt ready to burst, sent a signal that it was time to release.
"Giddy up♥ I'm shooting again♥"
"N-no!♡ I-I've hit my limit!♡ My womb is going to burst—"
"Ngh—♥"
Spluuurt!——♥
"—Ahhhhh!♡"
Ignoring Rebecca's pleas, I yanked her twin tails back with all my might and dumped my load inside her.
She climaxed, letting out a high-pitched squeal that sounded almost like a scream of pain.
My thick, veiny shaft deep-kissed her cervix, pumping out torrents of semen.
Of course, her insides were already so full that the semen immediately began to overflow and leak back out.
Spurt!——♥ Spurt!——♥
"Ngh-ah?! M-my stomach is so hot♡ It feels like it's going to explode♡"
"Mgh♥ Oh♥ Swallow every single drop♥"
It was no wonder she was struggling; a massive amount of thick, lava-hot fluid was pressing hard against the walls of her belly.
But there was no stopping the ejaculation once it had begun.
Spurt!——♥ Splat! Splat!——♥
"Ngh...♡ Y-you maniac...♡ Just how much longer...♡"
"Haaah♥ There's more♥"
Spurt!——♥
"Ahhh!♡"
"Fuuuh—♥ Haa, haa...♥"
Having emptied myself completely and finally slipping out of pleasure's grip, I let go of her hair.
As Rebecca collapsed, her pussy naturally began to slide off, but my cock didn't slip out smoothly; the flared head of my glans got caught inside.
The tight, clinging flesh of the Celestial's vagina was gripping it firmly, refusing to let go.
"Wait a second, Sister♥ If you collapse like that—"
Pop!——!♥
"Ahhhhh!♡"
"—Oh?!♥ I was trying to tell you that this would happen♥"
Squirrrrt!——♡
Because the flared head of my cock had roughly scraped against her hypersensitive vaginal walls—already raw from being forced to take so much semen—Rebecca was sent over the edge yet again.
Rolling onto her back, she glared up at me with sharp, trembling eyes.
"Y-you...♡ Haa, haa♡"
But she couldn't do anything more than that.
Completely defeated and humiliated by my massive shaft, she had no strength left.
"Ah...♡ Haa...♡ Haa...♡"
Ultimately, her heavy breasts heaving with ragged breaths, she drifted off to sleep.
Her pussy, twitching like a fish gasping for air, slowly bubbled out thick globs of semen.

Rewinding time slightly, to just before Rebecca fell asleep.
Pound!♥ Pound!♥ Pound!♥ Pound!♥
Ah♡ Ah♡ Ah♡ Ah♡ I'm cumming♡ I'm cumming again♡ I already came, so please let me rest just a little♡
"..."
Silvia stood right outside Iris's bedroom door.
Both individuals inside possessed the most noble bloodlines in the Empire, and both were rulers who conquered and governed their own territories.
That was supposed to be the case, yet the sounds leaking through the door were so vulgar and obscene that it sounded as if two beasts in heat had been locked in a room together.
Pound!♥ Pound!♥ Pound!♥ Pound!♥
Ah♡ Ah♡ Ah♡ Ah♡ Stop it♡
Smack!♥
Ahhh!♡
"Ngh...♡"
Even when she covered her ears, the sounds came through so clearly that a sudden heat flared up in Silvia's lower abdomen.
Those scream-like moans.
They vividly brought back memories of when her own insides had been ravaged by Iris's massive cock.
Her womb seemed to drop of its own accord, defying her will as it prepared itself to receive her master's shaft.
"Is Iris still busy?"
"Yes, she is."
When Elaina, the representative of the Dragonians, asked, Silvia replied while feigning composure.
Elaina swallowed hard as she watched the door rattle and dust drift down from the ceiling.
She didn't need to look inside to know exactly what was happening.
N-no!♡ I-I've hit my limit!♡ My womb is going to burst—
Spluuurt!——♥
—Ahhhhh!♡
It was the scream of a woman being bombarded by an internal ejaculation.
Elaina forced herself to ignore the throbbing heat in her own lower belly as she looked at Silvia.
"I-Iris said she had instructions for us. Did she mention anything to you?"
"Ah... I heard she wants us to pave a road."
"A road?"
"We need a path to transport the tribute to Her Imperial Majesty."
"...We have no need for roads. We cannot pave one to meet the Empire's standards."
"She said to just clear the snow and lay down some rough stones. We just need to connect it to the road of the neighboring territory to the south."
Naturally, building such a crude road would normally lower a lord's evaluation.
However, that Celestial princess, now completely subjugated by Iris, would have no choice but to write whatever evaluation Iris wanted.
She was truly a terrifying existence.
Even if she appeared to be running wild solely on lust, in reality, every single action was calculated.
...Probably.
"Understood. If it's just that much... Ngh♡"
Elaina quickly turned around once her business was concluded, fearing she would go into heat if she kept listening to those sounds.
Standing out in the cold blizzard would surely cool her down.
"—Haaah♡"
Once she confirmed Elaina had left, Silvia clutched her lower abdomen.
Her insides kept throbbing so intensely that it was getting harder and harder to stand.
"Silvia?"
"Ah♡ Y-yes! I mean, yes, Master!"
Silvia quickly opened the door, trying to hide the sweet, breathless tone that had slipped from her lips.
The noble Celestial, Rebecca, was collapsed on the bed like a limp slab of white meat, sleeping softly.
Iris, who had called Silvia into the room, sat with her legs arrogantly spread wide.
Between them, the towering pillar of flesh that had just brought a heavenly being to her knees radiated a dominant presence.
"Clean up."
"Ah♡ Yes♡"
As if possessed, Silvia quickly approached Iris and dropped to her knees.
Iris tilted her head in confusion.
"What are you doing? I asked you to clean the room. It's a mess."
"Ah...♡"
Because they had thrashed around the room in every position imaginable, the furniture was completely smashed, and piles of semen lay scattered everywhere like melting snowmen.
Iris had literally just asked her to clean, but Silvia had jumped to her own conclusions.
The maid's face flushed bright red with embarrassment.
"I-I'm sorry♡ I, well, that is...♡"
"You pervert♥"
"Ngh...!♡"
Iris had no intention of letting her off the hook for her misunderstanding.
She used the degrading label to fuel the maid's shame even further.
The lord extended her leg toward her subordinate.
Using her toes, she nudged Silvia's chin upward, forcing her to look up.
"You've turned into a complete female now, haven't you? Getting all worked up and going into heat without even being ordered to♥"
"I, I...♡"
"Why don't you glare at me and show some of that pride you usually have?♥"
There was no longer any venom left in the assassin's eyes.
Only a desperate craving for her master's affection remained.
Silvia gently grasped Iris's beautiful foot, stuck out her red tongue, and began to lick it.

"Mnh...♡ Haa...♡"
"Good girl♥"
I can't help it...♡
Against a tyrant who grinds even the heavenly race into the dirt, what could I possibly do...?♡
Although the north was known as the land of the Dragonians, other foreign tribes lived even further north than the Dragon Mountains.
They were not a single unified tribe, but rather a gathering of the weak who had failed to adapt to the harsh environment.
The only reason these outcasts managed to survive without dying off was because they had a protector.
Castiel, the King of Life.
He was once the Prince Consort of Empress Eleonore, but he had abandoned the Empire, unable to bear her tyrannical rule.
Today, the gentle-faced king was once again tending to the sick in the sanctuary he had established in this cold, desolate land.
"Father. I hear the Dragon Mountains have been conquered."
"W-what...?"
A woman approached Castiel and reported.
Camilla. She, too, was a Celestial who had once been known as the Third Princess.
Though she had been a strong candidate for the throne, she admired her father's benevolence and had followed him all the way here.
While Castiel was small and slender, she was tall and possessed an incredibly voluptuous figure.
Aside from sharing the same vibrant green hair, they bore no resemblance to each other.
"Has Eleonore swallowed the north now...? Someone actually defeated the Dragon Queen? S-surely they won't target us here...?"
"Do not worry, Father."
Camilla offered a reassuring smile to the anxious Castiel.
"As you know, Mother only dispatches standard Imperial family members to the frontier, not Celestials. No matter which of my siblings comes, I will protect this place. The one who conquered the Dragon Mountains seems dangerous, but they have no reason to leave their territory and attack us."
"Y-yes...! I suppose you're right...?"
Lying in her room and chewing on a piece of jerky, Iris stared up at the ceiling and shouted.
"Ah—! Time to go claim Sister Camilla next!♥"