Course Demonstration: Human Sexuality
Aware of what was in store, she knew she could be used for "hands-on lessons" when she signed up to be the model for a human sexuality class. However, she didn't anticipate getting so enthused about it.
With some trepidation, I gently pushed open the classroom door. My apprehension increased when I saw no one but the instructor there. "Come in, come in!" he called out, noticing my hesitation.
I walked in and made my way to his desk. "Nice to meet you," he shook my hand, "I just need you to sign this form here," he pointed to a piece of paper on the desk. "Just the standard waiver. You'll get paid at the end of the lesson. Also, I should let you know that this is a practical demonstration, and you will be completely exposed."
"Yes... of course," I replied, taking a pen and glancing over the contract. Being nude wasn't unusual for me, as I had modeled for the art department before. However, this was my first time displaying for biology.
Catching a glimpse of someone sitting in a chair next to the chalkboard, I noticed George, the male model for the demonstration. He appeared nervous, looking away as I approached. "This is George, the male model," the professor said. "Have a seat next to him."
I sat down in the chair next to him. He clutched his lap, his fingers intertwined. I recognized him as a third year student, and he looked familiar to me, though we had never spoken. "Is this your first time too?" I asked, attempting to start a conversation. Just as I was engaged in talking to him, a group of students barged in, laughing and chatting amongst themselves. Soon the entire room filled up and they took their seats, facing the front with their desks.
Once the room was filled, the lesson began. I stopped paying attention to what the teacher was saying and checked out the students. Some of them were first years, whom I didn't recognize. Both boys and girls occupied the seats, but most of the boys kept glancing at me and smirking. I became concerned when the teacher asked George and I to stand in front of the class.
"Please remove your clothing," the professor instructed. I have to admit, I relish being nude in front of art classes. The entire attention on my body has a thrilling effect. I slid off my sweater and my vest top. I unbuttoned my jeans and pulled them off, one leg at a time until I was just wearing my simple white underwear.
George, standing next to me, had removed his clothing too, his Calvin Klein underpants now his only covering. As he lowered his underpants, I stole a glance over to him and saw that he had a massive member. Although soft, it was thick and long, surrounded by a large patch of hair on his abdomen and chest. I was so engrossed in examining him that I momentarily forgot about my surroundings. I quickly shielded my face as I turned my gaze back to the students.
Still feeling some excitement, I unfastened my bra, displaying my small, firm breasts. I removed my final piece of clothing, sliding down my knickers and showing off my neatly trimmed bush. Some of the students were uneasy, their faces flushed, while others looked aroused. The boy in the front row was smiling at me, his eyes sparkling.
George and I stood in position as the professor continued his lesson, walking back and forth in front of us, talking about various anatomical features and highlighting them with a telescopic pointer. "Here, the female breasts are not yet aroused. The nipples are not yet firm," he gestured towards my chest with the pointer. "And here, the female genital region. Not to be confused with the vagina, which we cannot see at this moment. Miss _ has chosen to only trim her pubic hair."
I was partly aroused, and my heart was racing. The thought of the boy in the front row with his twinkling eyes made me even hotter.
"Alright," he spoke, walking back in front of me. "Sabrina, please lie on the desk. Yes, like that, elevate your legs." I lay on the desk, my feet pointing toward the students. Per his request, I spread my legs and rested my feet on the desk. Goodness, everyone could see my pussy now. I cherished the thought, yet I couldn't see them as I looked at the ceiling.
The professor commenced pointing out body parts with a pointer. "This outer area here is known as the labia majora," he declared. The cold metal of the pointer touched me, and he gently pulled my lips apart with it. "Here's the vaginal opening, and above the labia minora. This individual possesses relatively small labia minora, but it's not uncommon for them to be much larger and extend past the labia majora."
The pointer was still softly touching me. My heart was racing now, and I felt my pussy getting wet. I prayed it wouldn't be visible. "This ensures the urethral opening, which is where urine is released from and also where female ejaculate is released. We'll discuss that in Week 5. And lastly, the clitoris. Guys, be attentive as to precisely where that is," he jokingly remarked as the pointer arrived at my clitoris, buried beneath its hood. The class chuckled in response.
"Thank you, Sabrina," he instructed, allowing me to stand up once more. We resumed our stand naked before the class while he droned on about arousal.
Eventually, he once more pointed at me. "Remember how we viewed that the subject exhibited no signs of arousal?" he asked. Somewhat hesitant nods emanated from the class members. "George, please rub or suck Sabrina's nipples. Let's see whether we can stir them up."
Nervously, George approached. He took one hand and cupped my breast, cautiously rubbing my nipple with his thumb. It felt nice, and a surge of pleasure flooded through me. The professor was getting excited now, "Look!" he exclaimed, "as expected, the areola has tightened and contracted, and the nipple has enlarged as blood has flowed into it."
I was appreciating the stimulation quite a bit and my breaths were getting deeper. "Watch how the subject's breathing has also altered," said the professor, "George, give the other nipple a suck, see how much you can stimulate it."
George leaned down and enveloped my other nipple in his mouth. His tongue was moist and warm as it explored my nipple. "Suck it, not just lick it," said the professor, somewhat displeased with George's approach. He started sucking more skillfully, delight bringing me. I involuntarily released a gasp, pleasing the professor immensely as he enthusiastically gestured to the class.
"Alright, that's sufficient," he declared. George returned to his seat beside me. The professor indicated my areola with the pointer and flicked it with the tip. "Look! It's incredibly hard and much larger now. That's the outcome of the heightened stimulation we witnessed."
"Now, let's examine arousal in the male," he instructed the class, redirecting attention, "Who can identify the most evident signs of arousal in the male species?"
Pause brimmed, but then a girl in a beanie from the middle row raised her hand. "Erection?" she asked.
"Absolutely!" the professor said. "All the similar signs observed in the female may present themselves, increased heart rate, altered breathing, even hardened nipples, but the most obvious sign will be an erection."
Turning to me, he commanded, "Sabrina, please get on your knees and stimulate George's penis with your mouth." My heart missed a beat but soon started racing. The notion of sucking George's mammoth cock in front of the entire audience sent a bolt of lightning to my cunt.
The professor reached behind the desk and produced a cushion. I placed it on the floor in front of George and fell to my knees on it. His dick was so close to my face. It was still soft, but long. My fingers encircled his length, my hand just managed to span its girth entirely. It twitched in my palm. I wrapped my other hand around it as well, which still left almost a foot of saturation remaining in my mouth.
Now it was George's turn to inhale heavily as my tongue teased the top of his cock. I could feel the throbbing and increasing hardness in my hand and mouth. I bobbed my head forward and backward, just managing a couple of inches in my mouth; however, I concurrently manipulated his shaft with my hands.
The class fell silent, watching intently while I sucked him and he swelled and hardened. I felt their gazes on us. The notion of performing this in front of such a large audience made me shudder with enjoyment and my vagina ached with desire.
"I removed his member from my mouth, staring at it, still clutching it firmly in my hands. It had stiffened to its full glory and was wet from my saliva."
"Well, ladies and gentlemen, if you look closely, you'll notice the veins on his penis have become more prominent, and his scrotum is no longer dangling low but rather tense. Quite a spectacular display, don't you think?"
My eyes darted around the classroom, curious to see the reactions on their faces. A few looked shy, while others appeared excited. Under the desks, I noticed the boys also seemed to be aroused, as their trousers held prominent bulges. I suddenly felt even more turned on by the thought of there being fifteen other stiffened cocks present. The girl with the beanie nervously crossed her legs, and I knew what she was feeling due to her actions. The girl with blonde hair was more daring, sitting with her legs open and her light blue panties displaying a darker wet spot in the front.
"I believe that is sufficient." the man stated, causing ripples of laughter from the class. I straightened up and wiped my mouth with the back of my hand.
Now, let's move on to the other signs of arousal in women. Sabrina, could you move around to the other side of the desk for us please?"
Without hesitation, I turned around and bent over the desk, my hands gripping my buttocks and pulling them apart. My entire sexual apparatus was visible from this angle - my parted lips and my asshole. The man continued, "Now, what other changes can you spot?"
One of the boys cleared his throat, attempting to speak. "She's wet?" he offered.
"Great!" the professor responded. "The vagina has produced fluid to aid in lubrication, and one can see it dripping out in this instance. The act of receiving stimulation from her partner has indeed awakened her desires. Is there any else?"
Several girls were quiet, some with their hands covering their mouths. Until finally, a nervous voice amidst the group spoke out. "Her labia are swollen?"
"Exactly!" he applauded. "As you can see, both the vulva and vagina have swollen, engorged with blood. Her clitoris appears much larger and redder than before."
There I was, still bent over the desk. The cool wood pressed against my stomach, trapping my nipples. I caught a glimpse of the boy who had been staring at me most avidly, his hand rubbing against his bulge under the desk. Some girls had their mouths covered in shock, others staring at me with longing eyes. Beanie Girl in the second row also appeared to be massaging her crotch under her desk.
George stepped up behind me, his cock grinding against my entrance. "Shall we continue?" he asked.
In response, I felt him push into me, filling me on one swift movement. I burst out in a cry at the sensation - a combination of pleasure and embarrassment for being so exposed. Again, my heart raced at the thought of being fucked in front of a classroom filled with people. During this thrilling experience, George gripped my buttocks and thrust into me, his hand roaming my back, restraining me onto the now-familiar workstation.
The professor moved around, discussing sexual responses, only briefly turning his attention to us occasionally. I lay there, feeling the full impact of George's thrusts and the emotional rollercoaster I was on as I resisted the climax I was desperately anticipating. [my actions]
All of a sudden, the professor exclaimed, "Hold up right there, George. Well done." George stepped back, and I gazed around. He held his erect cock with one hand, and it was coated in my wetness. I felt hollow and exposed, like something essential had been taken from me, leaving me incomplete. The professor was emphasizing the sticky wetness on George's cock.
"Let's move on to showcasing a few other sexual positions," he stated. "Sabrina, would you mind lying face up on the desk, and we can demonstrate the missionary position."
I lay on the stiff desk, and the professor handed me the pillow to placed it under my head. Luckily, it was an old oak desk, so it hardly shifted when George climbed on top of me between my legs.
"In the previous position, we observed that the penis can stimulate the G-spot, but the clitoris would require manual stimulation," he elaborated. "However, the male's pubic bone can offer some clitoral stimulation in the missionary position," he continued, but I was fully absorbed by the sight of George's massive cock entering me once more.
George and I stared into each other's eyes, and he started to thrust powerfully into me again. I relished the feeling of him inside me as he drove his thrusts as deep as he could. I could sense another orgasm surging.
"George, can we show some kissing? Let's try to make it seem real for the class," the professor requested, before resuming his lecture on how the vaginal canal expands during arousal.
George leaned in and our mouths met, his warm tongue caressing mine. His curly hair covered my face as he explored my mouth with his tongue. The simultaneous sensations of the wild kiss and deep penetration immediately drove me out of control, and I plunged into the abyss of orgasm. Screaming, I clawed at George's back as my entire body was enveloped by wave after wave of pleasure.
George gradually slowed, and we shared another kiss as I descended from my euphoria.
"Anyway, we planned to cover the female orgasm in week three, but not anymore," the professor informed George before discussing how only a quarter of females can reach orgasm from penetration alone.
He still gently moved his cock in and out of my wet cunt, giving me a break after my climax. I was already wishing for a more private session with him. He was also a skilled kisser.
"Fantastic," said the professor, "But we're running short on time, so let's explore the male orgasm." He fetched a chair and positioned it in front of the audience. "George, take a seat on the chair, and Sabrina, ride him while the class can see clearly."
I walked toward George sitting on the chair. I felt weak and shaky from my recent orgasm. I could feel my fluids oozing from my cunt down my leg, and I was drenched in sweat.
The students' anticipation was palpable - Nice Eyes and Beanie Girl were both furiously rubbing their cocks under the desks. The rest of the class anxiously shifted in their seats.
I turned my back on the audience and straddled George, sinking onto his cock and feeling him fill me once again. The professor highlighted the intricacies of our union.
I began to ride George, wrapping my arms around him as I grinded against him on the chair. I wanted this love-making to never end. The idea of an entire class watching me on top of George only increased my lust. I started to fuck George passionately, locking our lips in a frenzied embrace.
"Once you're ready, George, feel free to climax inside her," the professor instructed, stepping back to allow a clear view of our actions. George's hands held my ass as he spread me wide, setting my body ablaze again. I could not hold back another orgasm. I screamed as my entire body contracted, and my vagina clawed at his penis. His fingers dug into my ass as he roared, allowing the climax to wash over me.
Gasping, I threw off his cock, and his semen gushed out of me, coating his member and seeping to the floor. Geoff and I clung to each other, we were both saturated in sweat and cum.
The professor collected himself, "A highly impressive demonstration from our volunteers," he smiled. "Please show your appreciation." The audience clapped tepidly.
We smiled shyly, despite being soaked in sweat and cum.
George and I were sitting in on a lecture about sexual positions when the professor explained, "When guys are in missionary position, the semen can leak out of the female if they're not using it for breeding."
After the bell chimed for class to conclude, he shared more thoughts while everyone else was putting away their belongings. "For this week's assignment, describe all your experiences with numerous partners. I'd like a detailed report of two thousand words, due the following week."
Once the last student had left the room, we quickly got dressed, pocketing the twenty-pound paychecks given to us by the professor. "Not a bad introductory course fee," he said, as he left the classroom for the day.
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