Summoner: Monster Girl Harem!

It was like seeing a different side of this cute and fluffy girl who seemed to never think of anything; her body sat on his hips as she continued to gyrate and stroke them along his fully hardened member before she extended a single nail.

The glimmering silver nail shone in the basement gym's light as she whispered strange words that formed a green and blue magic around her nail.

She spoke in the language of beasts; to Vincent, it sounded like a series of meows and growls.

However, the low rumbling sound flowed through the entire house and reached the kitchen, where Luna placed the final dish.

Her hands trembled as she began to show a mother's look, rather than a woman who was after Vincent, as she whispered to herself, "Such a hasty girl, that oath is once in a lifetime. He still doesn't understand; what if he rejects it, and then you lose that power forever?"

"I, Zerana Mistral, a descendant of the white tiger, swear on my true name."

"To give my heart, soul and affection to this mate I choose."

"Never allowing the stinky women to steal him."

"From this moment, Zera's happiness shall be Vincent's happiness..."

"So please don't hate fishies and tasty meats!"

"Accept this from the centre of my heart."

"Half of my natal magic element of thunder."

A powerful electric feeling filled the area around his body; suddenly, everything that Zera felt and wanted began to flood his mind and heart the moment her sharp nail began to pierce into his chest.

She looked at him, wondering if he would accept, slightly trembling with fear in her eyes.

He gently smiled, ignored the pain in his chest and whispered.

"It's okay; I will accept anything you have to do or need to tell me. I said it when we met, right?"

Her eyes widened then she tried to remember what he said; the nail began to pierce deeper causing bright red blood to ooze from the hole, before she easily pierced the right of his chest, closing to his heart or rather than the daemon core that replaced it.

The moment her silver claw pierced inside the black core, his body began to feel extreme pain like small little creatures ate the insides of his bones and muscles slowly as the natal lightning element poured into his body, forming their path.

Instantly the moment she met him, mistaking him for her mother and wanting to be close to him, his words were not something she understood at that moment.

He looked at her with a less manly face and seemed unreliable back then in the classroom and said. "Vincent Schwartz, your new owner! Cute little silver tabby cat!"

"Ah?"

Zera felt the familiar pang in her chest as the process started; a part of her slowly began to tear from her core, feeling pain equally excruciating as the one Vincent felt, as blood dripped from her nose and lips.

She showed no sense of pain and instead began to giggle uncontrollably as the claw finally entered inside him.

Her body leaned down, a strange sense of intelligence flashing through her eyes as she placed her nose against Vincent's, who seemed to grimace as the pain reached his organs and heart area.

"Hello, I am Zerana Mistrel, your new cute silver tabby cat!"

The voice was nothing like her previous ones, something strange and more mature, yet he knew this would be something temporary somehow; that cute and dumb tabby was probably her main state, and this alluring maiden of feline grace might be her transformation as a mass of lighting surrounded her body.

"Nnnm!"

Suddenly she moaned with pain as the same tattoo that appeared on the body of other girls he'd slept with or bonded with emerged.

This time the design was a small white tiger wrapped in pink petals and vines that spread across her pelvis.

Vincent's body suddenly felt the brunt of the lightning, it seemed this cute girl used all her will to slowly bathe him in this fierce god-like lightning that seemed to be some kind of punishment. It was like something kept scolding him in a deep voice, from a far distance.

"Damn, stinky man! Tainting my cute descendant! I'll cook you with my lightning... Ah, why can this goddess not leave her divine temple? I will eat this stupid male up! My poor cute Zerana and Lunaris...!"

A purr entered his ears as her body seemed to flop down as the ceremony ended.

"Vincent... Mine...Hehe...Zzzz,"

This ceremony was akin to the human marriage ceremony, Zera wasn't like her mother, and her beast blood was too thick and almost contained no human blood due to her being born from the tail of Luna.

The ceremony involved a beast giving half its natal element to its possible spouse or soulmate.

If the mate accepts, then both will now possess a linked element more powerful than the one exchanged during their first intercourse; this was created for those that might have been foolish and given their first time to the wrong person, or worse, forced to as a slave or being violated.

Should the person refuse, the beast would lose half of their Natal element, forever remaining half as powerful and often shunned by other beasts as a rejected or scorned.

However, it wasn't all negative as once the mate accepted, they would become empowered as the link would form an endless cycle where both party's elements would flow between each other, like a perfect circle.

In this case, Vincent would gain the powerful lightning element, and his speed would improve greatly over time with training and increasing his level.

Zera would become more powerful and intelligent, gaining her sister's frostfire and Vincent's Anima flame.

The biggest gain for her was none of this.

Since Vincent accepted this without question, the girl's mana would be converted into Anima over time. Like him, she would eventually become a new existence never seen before, able to create her own Anima until they both should perish.

A White tiger Daemon Beast.

Very likely to surpass even the ancestor of all tiger-type beast's in this world, one of the divines, Goddess Verash, the white tigress.

Even though her part of the ceremony finished and she fell asleep on his chest, bathed in the lightning as it improved her body, also making her even more beautiful, causing her hair to grow longer now reaching her butt and adding some strange black streaks to her hair.

"Ah, you are mine too..."

[That's not how you intended to do it, right? Haha... but I feel she is like this; good job not breaking this little girl's heart, darling]

"Mmm...  I am a little tired... Please wake me when a few hours have passed, or this painful baptism ends.

[As you wish, master Raizel was very jealous. Please also look at her; that girl is already crazy in love with you...]

"Ah..... I promise...to not ignore.... a single one of them..... even you... Meiya... Zzzz...."

Silence filled the room as a white tiger lay sleeping on her beloved master's chest, slowly rising and falling with his slow, deep breaths.

Both with faint smiles, ignoring the painful bath of lightning and enjoying their happy dreams together.