The Subject

Having completed the written portion of the Midterms the day before, the students of 7thwere now ready for the 'practical' section.

After everyone had seated, Mr. Bentley laid out the ground rules.

"As I said yesterday, each of you will engage with one of the Subjects. I've used AI to generate the list of couples as well as the order. You'll have 15 minutes to cum while making the Subjects cum as much as you can. This rule does not apply to Dara. Dara, you'll have 15 minutes flat. Make the most of it." He smiled at the raven-haired girl who nodded in return.

"Now, as the AI is randomizing the pairings, the Subjects may not get equal attention. For example, Marcia may end up with six students, while Katy may only end up with three by the end of the week. The only stipulation I applied was that a Subject cannot be paired with two students back-to-back. Does that make sense? Any questions?"

Tim raised his hand, which Mr. Bentley acknowledged.

"So theoretically, the computer may just take two of the Subjects and leave the other two out?'

A slow nod. "Yes, theoretically, that could happen." The four Subjects looked at each other in despair. Imagine sitting there for days and never having sex!

"Can we make a plan that, if one or two of the Subjects don't get to have anyone over this week, the class can gangbang them on Friday afternoon?"

The class immediately erupted, agreeing loudly with Tim's suggestion. Mr. Bentley shook his head in amused exasperation.

"Tim, your suggestion...that if one of our Subjects does not get to have sex in here for the rest of the week, they will then have sex with all 18 of you? Is that your idea?"

"Yes sir! It's the least we could all do! And...and if it's two girls, then it would be nine and nine!"

The teacher looked back at the Subjects and was a bit surprised to see that they were all nodding as well.

"Ladies, if in the very small chance that one or two of you goes without coupling this week, would you agree to a class-wide gangbang?"

They all looked at each other, then to Marcia, who said, "Yes, sir! That sounds good to us!"

"You all realize the implication of this...if it's only one of you, you'll be having sex with EIGHTEEN people. Are each of you prepared for that monumental challenge?"

The four looked at each other longer, then looked over the class.

Marcia then looked back. "Yes sir, I am."

Katy nodded. "Me too."

Kaia's face set in a determined smile. "Yes."

"Lily?"

Lily was still looking over the students.

So many...

Then her gaze stopped at Steve. He smiled at her and she blushed.

Without averting her eyes, she said, "Yes, I'm prepared."

Mr. Bentley chuckled. "Fine. As a matter of fact, I'll expand it a little. If one or more Subjects only engage with ONE student through the testing, I will allow the gangbang as well. All agreed?"

Both students and Subjects agreed.

"Now again, the odds are I'm sure very, very small, so..."

Lily interrupted. "The odds of one of us not being picked at all to be with one of the 18 students, with the stipulation that there won't be any consecutive repeats, is zero point three percent. So one in 330."

The room went silent and all eyes looked to the little Asian Subject. Mr. Bentley's mouth dropped open.

"Lily, did you just...in your head?"

"Um...yes...oh, and if the Subject is only with ONE student throughout the testing, the percentage goes up to point nine nine percent...just about one in a hundred."

The educator blinked, then grinned.

Steve began to clap, and the other students followed suit. Lily blushed deeply, but smiled, looking at Steve with love in her eyes. The other three Subjects crowded around and showered Lily with kisses, making her squirm and giggle.

Mr. Bentley let Lily have her moment, then announced, "Okay, let's get started."

-----

Daisuke Atano lifted Katy's left leg up a bit, allowing him to penetrate her pussy fully and causing the blonde to moan wantonly. The Japanese boy was always rather quiet and didn't really mingle much with the other students, but he observed as much as he could and applied himself fully to 7th.

Daisuke had already been accepted into Cal Tech, majoring in Computational Mathematics. He had a very heavy class load and it required a LOT of homework which took up most of his social time, so 7thwas important...it allowed him to derive pleasure while also satisfying his GPA.

The boy took a very systematic approach to the Subjects. He had entire spreadsheets dedicated to how each of the four girls reacted to different aspects of sex, as well as how they interacted with the other 17 students. When he applied the techniques he learned, they definitely paid dividends.

To him, Katy was the easiest to please. This was not because Katy was easy overall...he had just 'unlocked' her first. After he had accumulated data from the first two weeks of class, such as elapsed cum time, orgasm length, and sensitivity indices, patterns began to emerge that Daisuke could track. After studying the data surrounding Katy, Daisuke hit upon the sequence of activities that would maximize her enjoyment.

He had started with two full minutes of tit-fucking, massaging her fulsome breasts while he pumped them with his cock. She writhed and groaned as her body was played with while Daisuke timed his first phase to the second with his internal clock.

The boy then switched immediately to pressing his face into Katy's moist pussy, concentrating on her clit. He was rewarded with a thundering orgasm from his Subject, but he fully expected this. He also knew that he could layer another orgasm on top of the existing one if he slid his middle finger into the girl's ass and rotated it while sticking his tongue into her vagina. He did so and Katy shrieked, the anal orgasm Daisuke was predicting nearly breaking her apart. The student continued this dual assault for three minutes, sustaining the double orgasm and driving Katy insane with pleasure.

At the five-minute mark, Daisuke knew it was time for full intercourse. He spread Katy's legs and penetrated her missionary-style, massaging her breasts again as he sheathed himself in her. He did his best to regulate his own libido...if he came too early, it would effectively end the session and ruin his sequencing.

Now he had her left leg up and was thrusting deeply into the girl. He then massaged her right breast with his other hand while at the same time nibbling the nipple.

Katy was bucking and twitching, orgasms hitting her hard and fast. She had had a couple of encounters with Daisuke before, but it was never like this. He was using her body like an expert.

The other students looked on with admiration mixed with a bit of trepidation. It was always fun to watch Katy be fucked, but Daisuke was clearly setting the bar high for the rest of the class. Bess could see the impressed look on Mr. Bentley's face as he appraised Daisuke's performance.

The other three Subjects huddled together as they watched the coupling.

"Did either of you expect this from him?"

Marcia shook her head at Kaia. "Never...though I've seen him study us intently when he's not up on the dais."

Lily nodded. "I have Daisuke in a couple of my AP classes. He's VERY analytical. You can tell he has done his homework on Katy."

Kaia smiled, so happy to see hercoroin such a state.

With two minutes to go, Daisuke shifted his body, letting go of the leg and the breast. He now lay completely on Katy, his chest pressing down on the girl's boobs. He pumped her deeply while French-kissing her. Katy responded by wrapping her legs around his waist, which he anticipated. With about 15 seconds left in the session, the boy came, firing warm semen into Katy's twat, earning a happy sigh from the girl.

Daisuke slowly slid himself out of Katy, sitting back on his haunches. He smiled and put his hand out to help the blonde up into a sitting position.

"Did you enjoy that?"

Katy, breathing heavily, nodded quickly. "Omigosh, Daisuke! That was so good! I don't know if I've ever been fucked like that! I loved it!"

"Good. I'm glad my research into your body bore fruit. Thank you, Katy." He stood up and bowed slightly, then stepped off the dais.

-----

Daisuke got back to his desk and was dressed when Tamu approached.

"Daisuke, I would ask how you were able to do that. How did you so masterfully fuck Katy like that?"

"I can show you." He took out his laptop and woke it from sleep-mode. After a moment, a very complex Excel spreadsheet appeared, titled 'Katy'.

"If you look at this chart, this is all my accumulated data on Katy. I was able to distill this data into a sequence that would maximize her orgasms...their frequency, power, and length."

The screen was full of statistics, cross-referenced and calculated. Tamu was stunned at the sheer mathematical depth of what he was looking at, where some of the numbers were figured out to six decimal places.

"I also have workbooks for Marcia, Lily, and Kaia."

"This is amazing! I wish I had something like this for Katy."

"Here." Daisuke moved the mouse to the bottom and Tamu could see tabs with all 18 students' names. He clicked on 'Tamu' and a different page popped up.

"The sequence broken out here is very different due to a number of factors, including but not limited to, your larger size, both body and penile length and girth, as well as your romantic connection to not only Katy but Kaia as well. Honestly, with the number of built-in advantages you possess, what I did to Katy is not even close to what YOU could do to Katy."

Tamu's eyes were wide as he tried to absorb the copious information. "May I...may I have a copy of this?"

"Of course. I will email it to you. Would you also like the spreadsheet for your sister?"

"I...very much would!"

"I will send that as well."

"What can I do to repay you for this information?"

Daisuke cleared his throat and seemed to blush a bit. "Well, I would like to know if you can...put in a good word for me...with Kaia."

"What?"

"Your sister is very beautiful and I would like to take her out on a date at least once. I do not typically have much free time, but once all the midterms are over, I will have availability over the break. I would like to ask her if she would like to go out with me. If that is alright with you and Katy, and her of course."

"Daisuke, I had no idea...and I don't think Kaia has any idea..."

"I would be surprised if she did. I have been trying to write an email to her..."

The boy then opened his Outlook and clicked on the Drafts folder. There were several drafts, all addressed to Kaia with the subject line 'An Invitation'.

"Frankly, I do not expect her to agree, but I know I at least need to ask."

There had to be at least 30 'An Invitation' drafts.

Tamu shook his head. "Find me after class. I will help you."

-----

"This time you don't have Bess to assist you, Lance."

Lance Kirkland stood on the dais, silently marveling over Kaia's beautiful ebon body as she approached him. All the girls he had ever been with had been shorter than him, and it always intrigued him to have to slightly look up at Kaia.

Kaia put her hands on Lance's shoulders and pressed her body against his, purring as she felt his rock-hard dick press against her. Lance responded by taking her hips in his hands and slightly rubbing her sides.

"Is your plan to trigger my sides like before?"

Lance shook his head. "No...I think that would be unfair. I'm going to do what I think I do best. On your hands and knees please."

Kaia was puzzled. She was sure that Lance would use her 'weakness' against her and had been steeling herself to combat this tactic.

What he's best at?

Lance got down on his own knees behind Kaia and waited for Mr. Bentley to give his signal.

"Kaia and Lance, you may begin."

-----

Kaia shivered as she felt Lance's tongue run over her clit and labia. Lance slowly brought his tongue up over Kaia's lips, across her taint, then concentrated on her little asshole. The girl squeaked in surprise as she was rimmed, Lance giving the anus some extra love. Then he began again, from clit to ass.

Kaia's body was twitching and jerking and she moaned as the oral pleasure continued. Then after eight or nine wonderful licks, Lance held his face between Kaia's ass cheeks, his tongue pushing her sphincter open. She could feel a wonderful rumbling in her tummy, the beginnings of an anal orgasm as Lance just kept playing with her butthole.

Then the tongue disappeared and Kaia's body calmed, but then she felt something hard press against her asshole. Her eyes widened.

Wait...Marisa loves anal sex...

Covered in his own spit as well as some lube kept on standby, Lance's cock pushed its way into Kaia's ass, earning a throaty groan from the girl. The building orgasm that had started to fade came roaring back and Kaia's muscles tightened in anticipation.

Lance loved Kaia's long, lean body. It was strong and her skin was a flawless shade of dark brown. He had wanted to fuck this girl in the ass for a while and seeing her take anal from Bess still stuck in his mind.

And he did love fucking girls in the ass.

Lance's penis descended slowly...achingly slowly. That metaphorical balloon inside Kaia's tummy continued to overinflate, ready to pop at any moment. She kept herself very still, knowing that one wrong move would pop that balloon prematurely, and she wanted to feel every moment of this buildup.

Then she felt Lance's pelvis push up against her butt. She hummed happily as the boy's cock fully occupied one of her two most intimate spaces. Her anal tract squeezed the invading rod, trying to get it to move.

She suddenly felt her head being pulled back. Lance had grabbed two handfuls of Kaia's prodigious braids and held them fast as he began to withdraw.

Kaia began to shake as the penis pulled back. Her body knew what was about to happen and it couldn't control itself anymore. The orgasm began to break through a thousand cracks in Kaia's tightened form. Her voice began to pitch high and her eyes screwed shut.

Lance brought his cock almost all the way out before he drove it all the way back in.

"AhhhhAAAAAHHHHHHH!!

Kaia came hard. Her eyes opened wide though her vision had grayed. Her skin flashed cold and sweat poured from all over her body, and all her muscles released as the girl spasmed and seized.

Lance had only started though. Now he was power-fucking Kaia's ass, one hand having let go of the braids to grip the girl's shoulder. The sound of slapping flesh echoed through the room as Lance pounded Kaia for what seemed like an eternity.

Kaia's eyes were rolled completely back in her head and her voice was a ragged keen as her anal orgasms just did not stop. Lance let go of the rest of the girl's braids, but Kaia barely noticed...her back was fully arched throughout the intense fuck.

All eyes were intently watching the action. The only people who were doing anything besides that were Mr. Bentley who was actively grading Lance's performance, and Steve, who was creating another memorable sketch.

At a certain point, Kaia lost consciousness for a few seconds. During that, her arms slid out to both sides of her, but Lance was still holding her shoulder and hip and was able to gently lower her body even as he continued to plunder her ass.

She was now prone, and Lance shifted himself and began rolling his hips to continue the anal assault. Once those seconds passed, Kaia roused, just in time for another orgasm to knock her senseless. Her voice was nearly gone and her mouth moved wordlessly.

-----

Bess was gyrating lightly in her chair, watching Lance butt-fuck Kaia. Her pussy was fully lubed and was trying to get Bess to somehow get Lance's cock inside her.

"Looks good, huh?"

Bess slightly turned her head and could smell black licorice.

"Hmmmm...y-yeah...it...it does..."

Dara slid her hands under Bess's sweatshirt and kneaded her breasts over her bra while whispering in her ear.

"You think he'll fuck you like that? You on your hands and knees and him behind you sliding that thick dick into you?"

Bess and Dara's friendship had grown exponentially since the beginning of Vice Principal Masterson's 'Independent Study' sessions. They would frequently touch base over the phone or between class periods to brainstorm new and different ways to double-fuck the educator in her office. Dara knew how much Lance turned Bess on.

Bess's vision started to blur as an orgasm started to build. Dara's hands slid under Bess's bra and were now tweaking and pinching the girl's nipples.

"Look, Bess...Lance is gonna cum."

-----

Now everyone could hear Lance begin to moan. He put his remaining strength into three powerful pumps, then let loose with a torrent of cum, coating Kaia's rectum with sticky white stuff.

-----

Dara moved one of her hands from Bess's breast down into her pants. She smiled to herself as her hand passed a dormant penis and two meaty testicles. She fought the urge to toy with those prizes and continued on to Bess's very wet pussy. A second later, she found an engorged clit and put her index finger on the little button.

Her other hand went to Bess's mouth and muffled it as she rubbed the clit.

Bess exploded, her back arching as the orgasm tore through her. Dara used all her strength to control the other girl, gripping her face with one hand as she continued to work Bess's clit with the other.

----

Lance sat back, his cock still inside the girl's butt, and began lovingly massaging her ass.

Kaia looked over her shoulder. "Uhhhh...that...was...mmmm..."

Lance smiled. "Good?"

"Better...it...was...great."

"My pleasure." He leaned a bit more back and his penis came free. He stood up on shaky legs, then helped Kaia up. She leaned in and kissed the boy.

"At some point, I may need you to do that to me again."

"Anytime."

-----

In the audience, Bess breathed raggedly, having rode out her very powerful orgasm. Dara withdrew her hands slowly, licking the fingers clean from the hand that was playing with Bess's cunt.

Bess turned her head and the two girls kissed.

"Thank you, Dara." She then looked over and Lance, still nude, was walking past her. She was fairly disheveled, flushed and breathing a bit heavy. He changed course and came over.

"You good?"

Bess began to charge up again, looking over Lance's strong, naked body. She blushed heavily, then swiped at him as he smirked at her.

"Lance, stop! Go put some clothes on before I explode!"

Lance laughed out loud and walked back to his desk. Bess tried to will her body to calm down. Dara hugged her.

"Now imagine if Tim were up next!"

Bess's eyes went wide and her pussy lubed itself a little more.

-----

After Lance and Kaia, Lily had a turn with Lars. It was a very good time for Lily, having watched two of her fellow Subjects get fucked. Lars used his 15 minutes making Lily feel wonderful.

This time, Dara was starting to get revved up, watching her baby sister get fucked. She pushed a vibrating egg into her pussy and sat back, her heart filling with joy watching Lily cum.

Then, as Mr. Bentley had speculated might occur with complete randomization, the next student (Clay) was paired not with Marcia, but with Katy. The little blonde's body was still getting over its session with Daisuke but Katy's motor shifted back into high when Clay climbed on stage.

The basketball player made Katy cum multiple times, moving from oral to vaginal penetration to anal all in just under 15 minutes. He was strong and did his best to not overpower Katy. Overall, the blonde held her own, now having been with Tamu multiple times.

Clay, after cumming deep inside Katy's ass, lifted her up easily and brought her over to the other Subjects who tended to her softly.