All sexual activity is with characters 18 years of age or older.
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Jake
The nondescript, brown-haired man, looking to be in his late thirties or early forties, poked his head into the classroom. "Oh, hey! What're you teaching in here?"
"Sex education," the thirtysomething male teacher answered him. Its official name was health class, but he was really teaching how sexual reproduction worked, so his mind, influenced by the newcomer's mental powers, answered without equivocation. "I don't think you're supposed to be here, sir."
"Of course I am," the strange man told him as he stepped in and closed the door behind him.
"Oh...excuse me, then."
The newcomer looked around the room and headed to a free desk. "Never actually graduated high school, so maybe I'll learn something." He gave the teacher a grin as he awkwardly sat in the desk.
The teacher nodded and turned back to the presentation on the screen. As he pointed to the cross-section of a woman's uterus and identified the parts, the strange man turned to the cute girl next to him, who looked to be a senior of eighteen years of age. "What do you think of this?"
The teen, with pink and blue stripes in her long brown hair, sighed. "We have this class every year and it's sooo boring!"
"So we should spice it up, right?"
She considered. "Right!"
The newcomer raised his hand.
The teacher stopped, frowning. "Uh, yes...?"
"Jake."
"What is it, Jake?"
"At what point do you teach them to have proper sex?"
The teacher sputtered. "We...we don't actually..."
"But this is sex education, right?"
"Well...yes."
Jake got to his feet. "Okay, so who here has had sexual intercourse already? Show of hands?" He looked around the room...about half of the students, including the pink & blue girl. "Perfect! Hand-raisers, pair up with a virgin of the opposite sex...there ya go..." He saw the guys rush for the hottest virgins while the non-virgin girls were more hesitant, but eventually two young women were left, one with her hand up, as well as the teacher, also with his hand in the air. "Mister teacher man, you and your experienced student, here, will show the others how it's done. Get those clothes off, all of you, and you can lower your hands." Jake saw the ring on the teacher's finger as the man disrobed. "You married, teach? How many women you been with?"
"Just my wife...been together since college."
"No shit? Funny that a one-woman man's going to teach all these kids to fuck. C'mere, girly," he beckoned to the remaining virgin.
The bespectacled girl was short, brown-haired, and slim, but with amazingly-bouncy B-cups with hard, pointy nipples. She'd removed her panties, but he could see a string dangling from her trimmed cooch.
"Oh, shit, on the rag, huh?" Her face blazed as she nodded. "Goddamnit...well, pay attention to the teacher's lesson and I'll get my friend over here to suck me as she takes that guy's cherry. He wandered over to the girl with the blue & pink stripes in her brown hair as he shucked his own clothing. "Okay, teach, space is at a premium, so I guess bend her over your desk and everyone else'll do the same."
The teacher nodded and directed his partner to lay forward across his desk. His student had dark skin but it was difficult to determine her ancestral origins just by looking...she had a nice booty, though, with smaller breasts boasting prominent nipples. "First, boys," the teacher instructed, "you need to make sure that your partner is sufficiently lubricated for sexual intercourse or it'll hurt." He dropped to his knees behind the girl. "Her vagina may already be wet if you've been kissing or making out, but you may need to apply direct stimulation. You can rub her vaginal lips like this..." He reached forward and the girl gasped. Soon, the other girls in the class were moaning their approval as their partners followed the instruction.
Blue & pink girl was bent over her desk, her face almost as pink as those strips in her hair. A shorter Asian guy knelt behind her, following the teacher's lesson to the letter. "You ever suck cock?" Jake asked her, and she nodded and licked her lips before Jake pushed his hard member between them.
"You can lick along her vaginal lips, which will feel good for her, and also your spit will help." The teacher stopped talking as he demonstrated, making his teen partner moan, and the young men of the class emulated him. After a couple minutes, the instructor pulled back and wiped his mouth. "Her clitoris will show itself as she becomes aroused, a nub at the top of her vagina...you will want to rub at it, lightly," he stressed.
"Ohh, Jesus!" a brunette cried out from the corner as she came, her husky body shaking as what looked to be a linebacker for the school's football team brought her off, his dark skin at odds with her pale body.
The teacher got to his feet. "When she's wet enough, you'll see her puss--uh, vaginal lips open up. At that point you can put the tip of your penis between them and push inside."
"Ooh..." his partner moaned as her teacher inserted his cock inside her hot box. Around the room, the experienced women helped their virgin partners line themselves up and slip inside with a sigh.
The virgin women, however, were another matter. Some grunted at the unfamiliar feeling of a cock slipping inside their unused channel. Others, however, cried out in pain as their maidenheads ruptured under the phallic assault.
"Shit, forgot!" Jake admonished himself. "Ladies, for your first time, pain will be pleasure...enjoy!"
Suddenly, the virgin females were gasping pleasurably as their more experienced partners delved deeper into their deflowered depths.