Professor Rin Tosaka - Tentacle - Student/Teacher (Patreon)

Rin Tohsaka, sometimes felt the need to curse her Kirei, her luck and her pride. And in that specific order. Because honestly, blaming the long dead fake priest just made her feel better.

It didn't change the fact that she was living the dream. Her own, and her father's, and his fathers too, and then his before him. And she hated it. She was one of the top students of the Clock Tower, people looked up to her even with how Asian's were typically looked down on in the prestiguous central for all magi.

She was one of only two students for Zelretch himself. Learning how to harness the vaunted, legendary power of the second true magic. The Kaeldiscope itself.

Yet...yet. "Stupid Emiya." Rin scowled, crossing her arms under her curvy bust, pushing them up and giving anyone who could possibly be spying on her quite the show.

It all came back to Emiya. And the Grail War too she supposed. God she wished she'd never even heard of it. what a cluster fuck! And in the end, what did she have to show for it? The boy she had a crush on was back in Japan, living the male dream, with his fucking harem, and she, who was too prideful to accept being part of a set, years later was stuck waving around a stupid looking sword trying to harness the power of the second magic, while her teacher was off doing who knows what in alternate realities?

Even her god damn rival Luvia wasn't stuck doing it. Because, Luvia was all too happy to be part of a set, and had fell hard for Shirou Emiya when he came to visit her with Sakura Matou, her once sister.

So here she was, doing this utter stupidity, swinging the ugly sword around, all alone, in the room designated for her research in the Clock Tower. While her annoying ass rival, the stacked blonde bitch that she was, was probably getting railed by the man she wanted. Luvia decided to spend christmas in the Emiya household with her other fellow harem members, Rider, Saber, Caster, Sakura, Ilya, even her own best friend from high school was bouncing on Emiya's dick these days.

And she knew quite well that Luvia was getting pounded good and hard. She was helpful enough to send her an image of the events in a Christmas card a few days back.

She could recognize Emiya's distinct red hair, and golden amber eyes anywhere. Rin had taken a moment to admire his naked physique, and thick cock, before her eyes were forced to take in her haughty bitch of a rival. Her dishevelled ringlets, her designer clothes nowhere to be sent, voluptuous form bent half over the dining room table of Emiya's home, she used to drink coffee there!

She was forced to grit her teeth in rage as she saw one of the saw's incredibly large breasts, being sunk into by one of Emiya's strong hands, and the way her leg was hooked over his shoulder, showing how flexible she was, her lacy dark blue panties hanging from her ankle. Showing how rushed they were to start fucking like animals.

And the loving way they stared into each others eyes as they rutted. It ignited the fire inside Rin's belly, and she'd fired Gandr's for over an hour when she first saw it. It was set up, all to show Rin what she could have had, but couldn't now. A big, fucking taunt from her cow titted rival!

"I hate that bitch!" Rin snarled, viciously slashing the Jewel Sword through the air once again.

Huffing in exertion after another twenty or so minutes of trying and failing to get the Jewel Sword to accept her prana moulding within it, Rin set it down and wiped the sweat from her brow.

"This is useless." the twin tailed magus scowled. She ran her hands through her hair, cleansing some of the sweat from it and walked towards her desk to grab the bottle of water sitting on it.

Rin had to admire the room she got to work in. Big, spacious, laviscously decorated, and layered with enough Bounded Fields within to stop some rather large explosions from getting out into the hallways.

Though, the beautiful Asian woman knew it wasn't really from her merits. It was merely because she was the teaching assistant of Lord El Melloi II, or better yet known as Waver Velvet. He was the foremost expert at the Clock Tower on use of basic magics that were learned as a child and looked down upon, with a huge following of up and coming magi family heirs practically worshipping the ground he walked on.

After the crazy shit Emiya managed to pull with just Reinforcement, Gradation Air and Structural Analysis, Rin wouldn't look down on basic magic ever again. And so she asked for lessons from Waver, and ended up becoming his teaching assistant. It earned her great admiration from many of her fellows, that overwrote the bias most had due to her Asian heritage, and granted her quite a few perks that she wasn't viable for before as Zelretch's apprentice.

She could have done without the teenagers leering at her though. She got enough of that in high school. Granted, Rin couldn't deny it did feel good for her beauty to be appreciated after the disastrous affair that was her previous love life.

She paused on the way to her desk, looking into the mirror on her wall and admiring herself. Most of her clothes were currently in the wash, so funnily enough, she was dressed up in the old outfit she used to run around in back in Fuyuki.

"Though it's a bit tight now." Rin mused, eyes lingering on her chest.

It had been six years since the grail war after all. She was twenty four years old, a fully grown woman, leaving the teenager she was then behind. Her breasts that were already a good handful even then, had swelled up, and while they weren't on the level of Luvia's fat udders, Rin had quite the hefty pair herself. 

"I suppose me and Sakura really are sister's after all." the black haired woman mused with a chuckle. Turning, she was about to continue on to her desk when a naughty idea came to mind, and she wanted to check something out.

Bending over, Rin got down on all fours and looked over her shoulder, hiking her ass up into the air and admired herself with a cattish grin. "My tits aren't the only thing that have grown." she eyed her full, perky rear end, wiggling it a bit and hearing the little clap of her cheeks slapping together from that alone.

"Man those horny brats in my class would probably pay good money to see this," she chuckled, then paused, "..I suppose I could actually give them a look thinking on it. Most of them are from some of the richest and most well established magi family around, that one kid has wyvern dna, he'd be good to father my kids." And she was horny, she hadn't gotten laid in years. The teenage magus would probably jump at the chance to rail her. 

He was the one who's eyes were on her the most in class. And she may have taken a little bit of pleasure and pride in that fact and sometimes gave him a little more to look at. A little brush against him there when looking over his work, a little press into his back squishing her breasts up against him, and just yesterday she'd 'dropped' her paperwork beside his seat and bent over, while wearing an incredibly tight skirt that just clung to her ass like a second skin.

It was all fun and games, endearing herself a bit to the heir of one of the highest ranking and powerful magi family. Who'd rose even higher this generation thanks to their breakthrough with infusing the heir with the dna of a wyvern. Not quite on the level of Saber's Dragon Core, but it made the boy physically capable of matching a lower tier heroic spirit, and his mana output was insane.

"I bet he can fuck for hours." Rin mused with a naughty grin, feeling her nipples harden under her red jumper.

Once again her thoughts were on her love life. And while wyvern dna added to her future children's genes would be amazing. It was nothing compared to the sheer power they might inherit from Emiya.

And once again her thoughts went to Emiya! With a scream of frustration, Rin whirled on her feet, a dark orb of compressed magic shimmering with crimson burst into life on top of her finger, "You know what!" the black haired beauty seethed, "Fuck Luvia! Fuck those horny bitches! And fuck Emiya!" she screamed, and fired the bolt of magic.

Rin's eyes widened a moment later when she saw the Gandr spell smash hard into the Jewel Sword on the other side of the room. And the sword lit up with an ominous crimson light.

"No, no, no no no!" she panicked, running towards it, skirt flaring up her hips and panties moulded to her ass.

Before she reached it though, the sword let loose a red shock wave of magic that pushed her bag. And the room shook as something large, dark in colour and heavy hit the floor with enough force to almost send the twin tailed woman flying.

The powerful force dwindled down a few moments later, and Rin who had crossed her arms in front of her face to shield herself hesitantly lowered them and took a look at what happened to her research area.

Her eyes widened immediately. The room was in total disarray, chairs and tables tipped over, research papers scattered around the room. But that wasn't what caught her eye. No, it was the big, thick purple...thing, jiggling around in the middle of the room. It looked like a deformed flower.

"What the hell?" The japanese woman muttered, eyeing it. Obviously it was brought here somehow through the second magic, but what the hell was it?

Lifting her finger up, she fired a low powered Gandr at it. The crimson red and black orb of magic power splashing harmlessly against its front, making it jiggle a bit harder, but that was all.

Rin was about to just shrug, when small holes opened up on it, and long tentacles, about half as thick as her arm slurped out, literally slurped out, that was what it sounded like to her.

Eight of them all in. "No..!" Her eyes widened in realization and she stepped back, reinforcement applying to her legs almost instantly.  The twin tailed beauty went turned and went to run, but the second she took a step forward and went to push off, she felt something wrap around her midsection and and a feeling of weightlessness filled her as she was lifted high into the air and dragged towards the tentacle thing.

"No, no no no no no no no no no no no no no! NO!" Rin screamed, struggling with all her reinforced might, to no avail. She knew where this was going. She was from Japan damnit!

She shuddered as two tentacles slipped around her arms, and two slivered around her legs and spread her eagle in the air. "NO-!" She tried to scream again, but she was cut off as a fifth purple tentacle slipped into her mouth, choking her, "GLugk!" the beauty gagged around the Phallic like appendage.

Two more appeared, winding around her torso and groping around her large, perky round breasts as the one in her mouth began to retract and then push back down deeper into her gullet, throat bulging as around the tentacle forcing its way passed her supple, pink lips.

The boys she helped teach probably dreamt about her wrapping her lovely lips around their cocks, and now some alternate dimension tentacle hentai beast was forcing her to suck it off. And despite it all, Rin couldn't help but moan and get wet as it wrapped around her sensitive breasts.

Rin tried pulling away from the fondling tentacles sexually assaulting her, pushing back against with all her reinforced strength, swinging her feet but they pulled her back in tautly easily. The twin tailed magus wriggled one hand free a bit from all her struggling, grasping at the tentacle wrapped around her arm and using her reinforced strength to try and rip it off, to no avail as her hand simply slipped along its slick flesh.

For her efforts, she was rewarded by one of the tentacles pulling her tiny black mini skirt up and spanking both of her perky, round cheeks, sending them jiggling and tanning them red.

"Nwwwho!" Rin squealed, through the tentacle invading her mouth, pain and pleasure shooting through her from the ass smacking she received. Her panties darkened and her thighs turned slick with forced and unwanted arousal.

Rin despite the front she put on, always enjoyed being submissive in bed. She liked a strong man, or even a women, to take her like a brute, roughly and without mercy. She'd often fantasized about one of her students just getting fed up with her teasing, one especially and just grabbing her by the twin tails and bending her over a desk and fucking her stupid, filling her up with his thick, young cock.

...Rin was a pervert. A closet pervert really, that hid her fantasies behind her no nonsense demeanour and pride. And her fetish for being taken 'against her will' was turning her on despite the fact her partner in all this was a grotesque tentacle hentai monster...thing.

The pair of tentacles on her long luscious legs continued moving upwards and and Rin felt a brief slimy caress across her gushing womanhood and was prepared for anything, but then instead they begun pulling back. That seemed like it could be a good sign, but as they reached her thighs and wrapped around them fully, securing her in place, she felt a breeze on her crotch, and then she realized, as she caught sight of the eight tentacle sliding up through her split legs, her silky white lace panties had been pulled aside, exposing her drooling pussy to the hentai beast.

Rin's lovely aquamarine eyes only had time to widen, before the tentacle shot up, and pierced her dripping wet vagina in smooth shot, slipping into her easily despite its thickness thanks to her own wet arousal and the appendages slick countenance

"MPHPHFF!" Rin squealed around the tentacle that was fucking her throat, as a mini orgasm tore through her, the first near phallus like object besides her small dildo's that had been inside her in years. It wasn't quite like a cock, but it was closer than her dildo, warm, and pulsing, and scraping against the pink walls of her tight little Japanese pussy.

Her core vibrated with pleasure, and Rin's eyes almost rolled up into the back of her head as a long spray of her juices shot out and splattered against the main body of the tentacle beast in front of her.

She fell limp from the sudden onslaught of pleasure forced into her, and the tentacles were free to use her as they pleased. One still fucking her mouth, the second inside her bounced her bodacious body up and down through the hair as it pulled out and pushed back inside.

The tentacles on her thighs slivered up and wrapped around her full, round ass cheeks, groping the doughy flesh, while the two around her arms slipped up and pulled her red jumper up over her chest, letting her two large breasts bounce free, capped with two hard little bright pink nipples.

What a day to go braless. Her student was actually supposed to be coming over to get some tutoring off of her and Rin had planned to use the chance to tease him a bit more, keep the room cold, have her nipples hard and poking through her shirt, her old outfit already tight on her bodacious breasts, and skirt riding up her full womanly ass.

Again, Rin's plans always seemed to fail somehow for her. If she ever became a Heroic Spirit, her luck would no doubt be Minus E-rank. 

The tentacles that free'd her large breasts to bounce free, wrapped around her soft jiggle mounds, constricting and squeezing into the abundant squishy flesh, before curling around to grasp at her tiny little pink nipples. And then began to pull on them.

The pulling on her bouncy tits stimulated another set of pleasure that shot down her spine to join the pleasure being fucked into her by the tentacle splitting her pussy open, and jolted the twin tailed woman's aquamarine eyes open, and her consciousness back into action.

She immediately moaned louder around the tentacle pushing down her throat.

Up and down, up and down the tentacle splitting her pussy open went. It never paused, but it didn't piston. It wriggled up and down as it went, slipping and slapping against every little part of her pussy.

Rin moaned, pussy juices dripping out on each wriggled it made up into her, lifting the bodacious Japanese woman up into the air, and then letting her fall, only to thrust up and carry her spasming body high up into the air, the thick slimy head slapping against her cervix on each and every pass.

It was maddening. Face flushed, aquamarine eyes rolled up slightly, Rin gagged and squealed around the tentacle in her mouth as the tentacles worked her over and fucked her up and down all they wanted.

She squealed and moaned through the air for a good maybe fifteen minutes, before a resounding pounding on the door caught her attention. The tentacle hentai monster didn't even pause in its molesting and raping of her, but Rin was just conscious enough to remember.

...Her student was supposed to be meeting her around now for their 'tutoring'. Her eyes, rolling up into the back of her head shot upon and swung to the door, and she stared wide eyed.

She couldn't let him see her like this.

"MMMF!" Rin struggled with all her strength, but once again to no avail, the tentacles just constricted tighter around her, squeezing her breasts and ass, drawing another squeal of pleasure from her that was muffled by the slimy appendage bulging out her throat.

"...Professor Rin!?" she heard him exclaim, having must have heard the sounds she made, "Are you alright?" he continued, and following up by wrapping his hand against the door again three times, knocking so loudly they resounded like booms throughout the room.

..And the tentacle beast paused. One of the few tentacles not molesting her slivered through the air and groped at the doorknob, but failed to open it.

Then it made a kind of shrugging gesture, and shot over to her, wrapping around one of her twin tails and tugging on it, drawing another squeal from her.

"Professor!?" The boy exclaimed, hearing her again, and she noted the worry in his voice. "That's it, sorry professor but I'm gonna have to break the door down!"

Boom!

The door flew open and banged against the fall behind. And she aw her young, handsome student standing in the doorway, leg outstretched. And despite the position she was in, Rin had to admire his sheer strength.

She had a bounded field protecting her door. Not even a Rhino could bull down her door going at a full charge. And he'd busted it open with a simple kick. That wyvern blood really made him stand heads and shoulders above even the peak of humanity from this day and age.

He entered the room  and his handsome face immediately locked onto her, and his eyes widened in shock when he took her in. "...Professor?" he gaped.

The second he entered, one of the tentacles lashed out towards him at breakneck speeds, crossing the distance after than most could blink. In a flash though, Rin's student lashed out with his arm and the tentacle was suddenly cut in half and the hentai beast let loose a shriek of pain.

It loosened enough on Rin for her to pull her head back, releasing herself from the face fucking tentacle with a spluttering cough, "Onyx!" she gasped out her students second name, "H-help me!"

To Rin's horror though the boy lost his shocked look and kicked the door shut behind him and pulled his mobile phone out of his pocket, and she hear the click sound coming from it as a photo was taken.

"W-what are you doing!" Rin cried out, fighting against the tentacles still molesting her, even as the central body of the tentacle monster shymied around to face off against her student wearily.

"No need to get your panties in a bunch professor, and those are some nice ones wrapped around those fat ass cheeks of yours," Onyx laughed and Rin felt a shiver of both dread and excitement go down her spine, even in the position she was in, he'd never talked to her with this kind of disrespect before, and never anything as crass as calling her ass fat, "I want some insurance from this. I'm kind of sick of having to jack off all the time with you teasing me all the time, so I'm gonna get some material here to make sure you do what I say."

Ah, in retrospect, maybe she should have given him a little taste in advance? She'd obviously frustrated the teenager quite thoroughly if it drove him to this. "You don't need that," Rin shouted to him, may as well put it out there, she was planning on using him as a marriage candidate anyway, "I was planning on letting you fuck me all you want anyway, just get this thing away and you can bounce me up and down on your cock all you want."

She'd much rather get fucked silly by her student than a tentacle hentai reject anyway.

With her position in the tentacles loosened a bit, she managed to turn a bit and began shaking her hips, wiggling her ass cheeks, "You like my 'fat ass' right?" Rin still managed to haughtily taunt from her embarrassing position, "Well it's all yours if you save me."

"..Damn right it will be." Onyx nodded, and stowed his phone away, "I've got enough material now in a few pictures and a little video just in case you go back on your word." He stepped forward, lifting his hands up and Rin saw flames coat his hands as he curled his fingers into claw shapes.

He shot forward, and Rin was suddenly overcome with another feeling of weightlessness as a sharp piecing squeal reverberated through the room, and suddenly she found herself held up in the arms of her student, the tentacle beast slashed in half and the tentacles burning away.

One tentacle though, just couldn't give up without one last shot at her, and Rin yelped as it lashed against one of her cheeks and spanked her hard, just before it was reduced to cinders.

"Thanks." Rin muttered, red faced as her student set her down on her feet, legs shaky, she smoothed down her skirt and pulled her panties back in place, but just when she reached up to pull her red jumper down over her large creamy breasts, her students hand caught her arm, "What?" she blinked.

"Don't forget what you promised." Onyx pointed out.

Rin rolled her eyes, and did her level best to ignore the way her already soaked nether regions throbbed with desire at the almost domineering way he said it, "A deal's a deal, don't worry I won't go back on my word," Rin huffed, and to punctuate her point, the beautiful twin tailed woman grabbed his hand and pulled it onto one of her breasts, letting him sink his hand into the doughy mound, "See? I'm good for it." she bit back a moan as he grasped her hard pink nipple and gave it a little pinch.

"Good..." Onyx nearly snarled in lust, and Rin's eyes widened when he wound his other arm around her waist and pressed into her desk, pressing his crotch up against her front, and what she felt there was massive. Like a baseball bat, no, even thicker, much thicker than any of the tentacles she'd taken just moments prior, "The only cock you should be bouncing on his mine, I'd have hated to spread the video and pictures of you around for everyone to see."

"You brute," Rin moaned, pressing into him, "You're just loving this aren't you? I bet you've dreamed of just forcing me down and taking me."

"I won't deny it," Onyx replied gruffly, grinding against her as his hand around her waist took a handful of her full jiggly ass and squeezed, uncaring of the juices dampening it, "But it's your own fault, you've been teasing me since the first day you became my professor."

..The first time was an accident. Rin had genuinely just dropped a pen while walking by him and bent over to pick it up. When she turned around after hearing a gasp, she'd caught him gaping at her ass, and it had just sent this naughty thrill through her, seeing the powerful, rich heir of one of the greatest magi family gaping at her in lust.

After that, she couldn't help herself, and used his reactions to fuel her her fantasies and spite against her old boyfriend. He didn't want to pick her alone? Fine, see how she would care when she had this rich, powerful teenager trailing after her like a puppy.

"I'll just have to make it up to you then, won't I?" Rin purred, her loins stirring and spite against her old boyfriend plunging her even further ahead, she leaned up in his embrace and submissively kissed him along the jaw line, "I'm all yours from now on. Any where, any outfit, any position, you can have me however you want."

"...I've always wanted to see you dressed up as a playboy bunny." Onyx grinned, pressing into her harder in desire, and Rin moaned at the thought. A slutty little playboy bunny outfit huh?

The beautiful Asian woman's hands went to his crotch and grasped the massively thick bulge tenting out the front of his pants, "If that's what you want." she purred in agreement, and Rin had to marvel at the sheer weight of cock she felt in her hands.

He was going to destroy her. And Rin was surprisingly okay with that.