Nio opened the door to her home to find the Demon King sitting happily with an enormous smile on her face.
"Nio!" Demon king exclaimed. The Demon King was a towering woman with pale skin, matching white hair, large breasts bigger than most people's heads, piercing yet kind red eyes with a large X scar across her face, large pointed ears. She wore tight-fitting black clothes though most of her torso was on display, she also wore a long black cloak. Though the strangest aspect of the woman called Demon King was that she had large black oxen horns atop her head along with a slender long tail that widened to resemble an axe blade at the end. Nio smiled at the sight of Demon King. The demon King had come to earth for a vacation and had bought Nio to be her pet for the time being yet despite her title and having paid for Nio to be her pet she often felt more like the pet than Nio.
"Nio shall we go out somewhere?" Demon King lept from her sitting position to her feet with ease. Nio nodded at the older looking woman with a smile.

Demon King bounded beside Nio happily now in a magic disguise that removed her horns and tail while wearing normal clothing rather than her fantasy cloak. Nio didn't have anything in mind for their date but Demon King, however, was more than happy to just spend time with Nio though.
"Demon king I'll be right back, I'll go get us ice cream." the young girl smiled at the towering woman.

Nio didn't make it back to her waiting friend/owner before bumping into an older man talking to two women, one blond, one brunette.
"Hey, you damn brat look were you are going you stupid snot!" the man snarled at the middle school girl, Nio's eyes darted between the three, noticing that all three were wearing the same purple scarves. Her heart began to beat rapidly.
"Are you gang members?" the small girl trembled.
"Your damn right brat," the blond woman grinned.
"Saints for life bitch!" the brunette woman snarled.
"And you just pissed us off!" the man grabbed Nio by the throat, lifting her off the ground with one hand.
"Now what do we do to make her pay?" the blond woman sniggered.
"Maybe see if she's got money, or maybe just slit her throat," the man pulled a knife from his pocket.
"Dem...on...Ki...ng," Nio rasped through the pain.
"Ah, what think a demon's gonna gobble us up?" the brunette women teased.

"Man you're d..." the man started before being cut off suddenly, his words replaced with a pained gasp as blood ran down his face and chest. Everyone looked to the man, they all stared in horror at what had made the man gasp, a clawed hand pierced through the man's chest, clutching the man's bloody heart in it.
"YES!" an angry voice replied to the dying man as Demon King's head appeared from behind the man.
"WHAT THE FUCK!" the blond woman screamed in horror. The man's body crumbled into dust releasing Nio. Demon King didn't give the two women much attention, she snapped her fingers. With the snap, all colour and sound drained from the world. Demon King turned to the rasping Nio.
"Nio are you all right!" Demon King threw her arms around the pained girl.
"Just hard to breath," Nio trembled. Demon king eyed the trembling girl.
"I see, if you'll excuse me I have two fools to deal with." she turned to the two gang women just as they both attacked, the blond wielding a knife and the brunette pulling a pistol. The blond thrust her knife into Demon King's chest only for the blade to shatter throwing the human to the ground, seeing this the brunette fired all nine bullets in her pistol at the demon's head but to the gang members horror, every last bullet bounced of Demon King without even making her blink.
"That fools like yourselves dare attack me is insulting enough but you hurt my pet! you hurt Nio! For that, you will suffer!" Demon King's words seethed with unyielding rage as she slowly walked towards the tow now cowering humans.
"Now what to do with you? Should I destroy you with one one-millionth of my power? No that might destroy the city ruining the plan for Nio and I's visit to the aquarium next week. Perhaps I should tear off your arms. No to much blood, it would make taking Nio home to alarming." Demon King taunted the two before an evil grin crossed her face. "I know what to do with you."
Demon King raised her hand before motioning towards herself, both women flew into the air towards her before stopping, still levitating off the ground.
"Look we're sorry, we'll do anything just please don't kill us!" the blond pleaded tears running down her face ruining her mascara. The brunette simply cried unable to even form proper words.

Demon King said nothing instead she closed her hand with a sadistic glee in her eyes. The two women howled in pain as their bodies began to shrink, the sound of their bones snapping only to mend back together smaller and smaller with each new break, soon the two mere only about two inches tall each dropping into the demon's hand, a small bubble appeared around her hand to prevent the two from trying to escape.
Nio recovered enough to stand, making her way over to Demon King and the two crying gang members.
"Demon King, what are you going to do?" the young girl asked concerned about the sudden cruelty her friend was displaying.
"You will see" Demon King licked her lips wickedly, she reached into the small bubble pulling the crying blond from it, she lifted the crying gang member above her. The gang members watched in horror as Demon King's mouth slowly opened below the crying blond, with no further delay she released the screaming woman. The blond plummeted into Demon King's maw which snapped behind her, the demon's tongue slammed the gang member into her cheek, her figure showing through Demon King's flesh, Nio and the brunette stared in horror, both were able to see the screaming woman's face before being pulled away from Demon king's cheek. She swished the screaming woman from side to side before faintly leaning her head back, the woman slid down Demon king's gullet The blond was forced down the demon's throat, the pressure crushing the gang member until she plummeted into a large pulsing pit.

Nio stared in shock at what she had just witnessed, unable to even form a sentence. Demon King turned to the mortified Nio.
"Would you like the other fool Nio, my dear?" Demon King smiling brightly at the young girl who just shook her head timidly. Demon King shrugged before pulling the now silent brunette from the bubble, Demon King tossed the woman into her open mouth as if she were a piece of candy and with a single swallow Nio watched the small bulge slide down Demon King's gullet.

inside Demon king's stomach, the two women fought fruitlessly to escape as her stomach acids rose quickly reaching their torso's, the two could feel the pain of the acid on their soft flesh, the horrible pain as it seeped into the newly exposed flesh as it burned layer after layer from the two.

Demon King threw her arms around Nio.
"I'm sorry I wasn't here sooner." Demon King's tone now back to its normal gentle nature, Nio could tell that Demon King was holding back tears, the human reached out to pat the towering demon's head.
"It's fine, you still saved me," she smiled which instantly cheered up Demon King who lifted her human into her arms with ease.
"Nio I adore you, so kind, so caring and so cute. Come let's go get something to eat, we never did get that ice cream. Despite Demon King's return to her cheery personality Nio couldn't take her mind off what she had just witnessed, she wondered if there was a chance Demon King was going to try to eat her.
"Yes I can eat someone at full size, but if I ate you I wouldn't let you get hurt, I would make sure you would be the safest person in this universe." the demon chimed without Nio even saying a word.
"How did you know?"
"You were staring at my stomach this whole time, but not with fear." Demon King whispered with a smirk, Nio turned bright red.
"Don't worry I'd never do it to you unless you asked." She leaned down to kiss Nio's forehead.

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based off the cute manga Vacation Maou to pet (no I don't get the name either)
just like beauty and a hungry beast girl if I can get people to check out the series I consider that a win.
(the thumbnail is a panel from the manga itself. so if that's not allowed that's on me)