Jenny chuckled quietly to herself as she flicked through one of smutty novels Maria kept under her bed. The recently captured heroine of the story was currently being pounded senseless by a mass of demonic tentacles, a situation Jenny found vaguely absurd. She was increasingly into some kinky stuff, but Maria had the really weird ideas.
Ideas like tentacle monsters, I mean how was a creature like that supposed to work anyway? It didn't seem to have a central mass of any kind, just tentacles that shifted endlessly to suit the author's needs. It would need to be made of, oh!
A slip of paper was inserted between the pages of the next spread of the book, covered in Maria's neatly ordered notation. Reading another wizard's notes was often difficult, but Jenny was familiar enough with her roommate's to grasp it quickly.
It was a list of modifications to be made to an already existing spell, and while it didn't specify outright which spell it was for there were enough clues for Jenny to guess. Opening her bedside drawer she pulled out the cowhide packet that held her spellbook. It only took her a few seconds to remove the book and flick to the correct page, it was a spell the two of them had used on more than one occasion.
'Ensnaring Mass' as it translated from the Latin was originally intended as a self defense spell. Once cast it created a mass of tendrils with just enough sentience to counter the struggles of any moving object it encountered. Their first class with it wasn't even over before Maria had come up with a kinkier use for it.
And now she'd gone a step further, altering it to add all sorts of new features. Jenny smiled to herself, they could have a fun evening with this. Her clock said it was 2.35, that gave her roughly an hour until Maria got back from her afternoon class. She'd better get started.
~~~
It took most of that hour to copy down the full spell, with all its many changes, onto a long thin scroll of paper. Two centuries back she would have had to recite the whole thing in one continuous chant, risking annihilation, or worse, if she messed it up even slightly. Instead she'd been lucky enough to be born into the modern world, so she had the luxury of rewriting the incantation as many times as it took to get it right.
Once committed to paper she 'canned' it, spooling it inside one of the bronze cylinders created for the purpose. Screwed tightly closed and with a vial of pig's blood at its centre the spell only needed a quick word to prime it, ready to be released with another word. She had just enough time leftover to shower and change before Maria entered the dorm.
When her olive skinned girlfriend opened the door Jenny was hidden behind it, ready to pounce. Like a snake she slid forward to grab her shoulders, "There's my little slut."
Maria started at the sudden touch, but soon relaxed at the sound of her voice, "Is that what I am tonight?"
Jenny wrapped her girlfriend's black ponytail around her fist and pulled, "You are, and I have a surprise for you. Now strip, slowly, and kneel in the middle of the floor."
Maria moved to obey, shedding her clothes one piece at a time. The twirl of her hips as her panties came down was unbidden but appreciated, Jenny watched with hunger in her eyes. Once her girlfriend was kneeling facing away from her nerves set in. She'd only done this a handful of times, she didn't have Maria's experience. She was still trying to get used to being in total control, it was hot but so much pressure to do well, for both of them.
"Jenny sweety, you okay?" Her inner turmoil was interrupted by Maria, looking up at her with those soft eyes, "Are you alright to keep going? We can take a break if you need."
There was nothing but love and compassion in her expression, and Jenny found herself falling for her all over again, "Yes, yes I'm okay. I want to top, if you want it?"
Maria's smile melted her heart and calmed the butterflies in her stomach, "Of course I want to, you look hot by the way."
Jenny blushed nearly as red as her hair, brushing her fingers self consciously through her loose tresses. They barely touched her shoulders, she'd been trying for weeks to grow it to the length of Maria's but it stubbornly refused. Her new black corset at least was perfect, money well spent, even if her parents would murder her if they found out what they'd been paying for.
"Now do I get my surprise?"
The sweet look on Maria's face was overtaken by something far more wicked as she posed the question. Jenny found herself quickly getting back in the mood anticipating what was about to happen. Channeling that arousal into a burst of confidence she grabbed Maria's ponytail again, using it to face her forward again.
"You're going to get your surprise alright. Close your eyes, and don't you dare peek."
Maria hummed happily and obeyed, and Jenny removed the spell from the drawer she'd stowed it in. She uttered the command and twisted the spool, her fingers tingling and the familiar taste of copper forming on the back of her tongue as the spell drank up the pig's blood and came to life.
She held the canister with one hand, directing where the conjuration should appear with the other. The beginning of the mass started to appear as a quickly growing blob, taking on a faint silver colour as the gathered energy glimmered and warped the light shining through it.
With the spell humming away nicely she was free to put the canister down and focus on the growing mass. It was a slower buildup than normal, but then all the modifications had made it a significantly more complex spell. The mass started to define itself as its semi-sentience awoke.
Distinct tentacles began to extend, questing out to find Maria.
Jenny's eyes trace their path eagerly as they make their way towards the impatiently shifting woman. The first tentacle brushed against her butt and she shivered, "Jenny what was that?"
Jenny grinned, "Your surprise."
Having found their target more tentacles began to move on Maria, feeling their way across her butt and thighs, one tracing up her spine.
Maria kept her eyes closed but half turned her head to keep speaking, "Jenny, is this what I think it is?"
"You'll soon find out I think, bend over and show me that perfect pussy."
Maria obeyed with a murmur of excitement, leaning down onto all fours, butt sticking out in the air. The tentacles tracing her shifted as their target changed, her newly presented legs quickly secured. One tentacle meanwhile ran up to rest on her lower back, sliding slowly down across her butt to trace the edge of her exposed pussy.
Maria gave a whimper, "Thank you."
Jenny felt immensely proud of herself, "You like your surprise?"
The tentacle was almost done teasing her, its tip now just barely inside her, the part outside her rotating to brush around her outer lips.
Maria bit her lip and nodded, "How did you find the canister though? I thought I'd hidden it perfectly."
A confused frown creased Jenny's brow, "Canister?"
At that moment something damp and cool wrapped itself around her ankle. A panicked glance down confirmed her fear, she'd been so busy watching Maria she hadn't noticed the spell coming for her too. She gave the command word that should have made it back off, but it didn't. A second tentacle meanwhile had now grabbed her other ankle. Her attempt to back away just caused her to fall, a wordless cry of panic escaping her at the same time Maria moaned loudly in pleasure, the tentacle in her pussy finally thrusting all the way into her.
Jenny lifted her head to see both her ankles still gripped securely and her girlfriend being fucked vigorously, wet sounds barely audible over her moaning. She tried to use another command, and then another, but the mass ignored her attempts. Instead it dispatched more tentacles to counteract her struggling, using the additional leverage to pull her closer an inch and begin spreading her legs.
"Maria! It's not listening to me, why isn't it listening!?"
The tentacle in Maria's pussy continued to fuck her as she twisted around as best she could, "Well I primed a canister, I was actually gonna use it tonight, but you beat me to it."
