Reposted with edits.
Teacher-student au.

"Stomp louder, why don't you?" Jongho hissed at his friend.

San smacked Jongho's head, making a thumping sound. "The only people on campus are nerds and extremely depressed people trying to get homework done. Do you think they'll be in the health hall at night?"

"I'm just being careful, that's all." Jongho shrugged helplessly.

"I hope you brought the tape."

"..."

"...Jongho?"

"I thought you were supposed to bring it," Jongho quickly muttered.

San shook his head. "No. We agreed we would each bring the wrapping paper, but you were to bring the rolls of tape."

Jongho shrugged. "It's a classroom. We'll find some."

Jongho and San arrived at the science buildings, particularly the building holding health and anatomy classrooms. Jongho paused to find the keycard.

"Take your time," San hissed. Jongho threw a death stare at him.

"Next time, I'll invite Yeosang to come with me, not you."

Once they were both in, they ran for the specific classroom. Jongho locked the door behind him as San turned his phone's flashlight on.

"You'd think they'd keep the lights on."

Jongho shrugged. "Lights are for cameras. It takes a year to replace a toilet for this school. Cameras are scattered."

San turned to him. "Really?"

"Yeah. My dad told me. Why do you think I chose to do this prank?"

"Wow." San whistled. "I've always been afraid I was caught on camera when I sucked a professor's dick."

Jongho stared. "I'm not sure how I feel about that when my dad's on the board."

San playfully grinned. "You never know... Hey, Jongho! It was a joke."

Jongho took a look around the room. "This is creepy, not gonna lie," he confessed. He set his backpack on a desk and smacked the skeleton model who stood in the back of the class.

"Oh, so now you think it is." San opened his backpack and took out the different colored wrapping paper. "Look for the tape over there. I'll look here."

Jongho walked over to a few cabinets at the back of the classroom. He looked through boxes and buckets, coming to nothing until he stopped at one.

"Oh..." he gasped.

"What?" San walked over and then gasped too. "Holy shit."

Jongho's hand grabbed a model in the shape of an erected penis. It was extensive and detailed, with the veins and color visible.

"It's for class?" San hummed.

"Find a hard dick model educational?" Jongho stared at the length and girth of it. The thing looked more like a dildo the way its head weighed when Jongho shook it in his fist.

"I don't know." San took the object. "But take your pants off, and we'll try it out."

"Are you crazy?"

"What? Want me to do it first?" San placed a hand on his hip. "I will."

"I know you would." Jongho rolled his eyes. He could see San's pleading, sharp, cat-like eyes.

He sighed. "I didn't know we would do this again."

San licked his bottom lip. "I'll make you feel good. I promise. And it will only hurt for a bit."

Convinced his best friend wouldn't do anything other than what was promised, Jongho slowly unbuckled his jeans and dropped them to his knees.

"B-But I don't know where that's been. Find a condom and lube if you can."

"Lube?" San laughed. "It's a health class, not a sex shop... But I'll find one for your thick ass."

Jongho joined in, too, loosely zipping his pants back up. The task of finding tape was long gone.

"Jongho..."

"I found condoms," Jongho took a few from the bucket marked 'Sex Ed Materials.' They were new and prepackaged. And surprisingly: king-sized.

"Jongho," San called again.

"What?"

"I found some lube..." San then lifted a pair of pink, furry cuffs from the drawer. "But I also found this. And I don't think these are for class."

"What are you two doing?"

San and Jongho jumped at the deep voice from the doorway. Standing there was their professor, Jeong Yunho. He wore a black suit, white button-up, with black parted hair slicked to one side while the larger part fell over his eyes. He was visibly tired yet serious.

"M-Mr. Jeong..." San nervously smiled. He stuffed the cuffs away.

"San. Answer my question."

"W-Well, we wanted t-to surprise you with a prank," Jongho answered. "And we wanted to find tape to..." he gave up, eyes tearing up. San protectively grabbed his arm.

"So why are you here?"

"I'm here to get a folder I forgot." Yunho held up a blue folder with papers.

"It was a harmless prank, we swear," Jongho explained.

"Harmless prank?" Yunho walked over and snatched the dick model from San's hand. "Going through my stuff and then..." He eyed the lube. "Looking to try it out?"

Jongho bit his lip and blushed while San stared his teacher up and down. Then his hand came to touch Yunho's. "Can I ask you something, Yunho?"

"San-"

"What are those cuffs for? Or... who are they for?" San's second hand touched Yunho's shoulder. "They're not very class-appropriate, are they?"

Yunho swallowed. "It's not... I can't... Mr. Song likes to have lunch meetings with me," he finally confessed.

"Oh." San reached up to whisper to his ear, but he only made it to his neck. "Look at him, Yunho."

Yunho's eyes fell on a timid Jongho still looking at the ground.

"I just wanted to test the model on him. Poor baby doesn't have a real man to rail him." San's fingers moved to pull Yunho's pants. "Can't you help us as the teacher?"

Yunho bit his bottom lip when he noticed Jongho's big, glossy eyes looking at him. He handed San the object.

"Fine. Stretch him."

San happily trailed towards his friend, warm breath tickling his neck. "You still want to do this?"

"Yeah." Jongho pulled down his jeans, then bent over the edge of a desk, plump ass sticking out. San carefully squirted some lube over his fingers, hungrily biting his tongue as it approached the younger's hole.

Jongho's fingers curved around the edge of the desk, fingertips digging into the hard metal. The sensation felt unfamiliar, yet he knew what it would gradually lead to. His eyes fell on the professor, who took a chair from the side to watch. Jongho's look moved toward the prominent tent in the man's black dress pants.

"Ready?" San asked from behind. Jongho shut his eyes as the object entered him. His mouth parted to release a gasp, nearly crying.

But as he opened his eyes to blink tears away, his gaze met the professor. It was expectant and lustful, holding the expectation — Jongho thought — that meant Jongho was to take the nine inches deep inside him.

San began moving the toy in and out to lather Jongho's entrance with lube. The remnant slipped down the back of his thighs, and San used two fingers to drag it up and push it back into Jongho.

"Good job, baby boy," Yunho praised. Jongho was about to smile when the man spoke again. "And you too, Jongho."

The youngest bit his tongue.

"Oh, did you want a nickname too? Like San?" Yunho stood to press up against San's back. He grabbed his hips and kissed his neck. "Sannie earned his nickname."

Jongho watched as Yunho pulled San into a rough kiss, the dildo stopping its movement in his fleshy walls. Jongho thought about taking it out, but Yunho grabbed it before he could.

"We're not done, Jongho." Yunho began thrusting it in him again. San pulled his tie, rosy lips pouting.

"Let me suck you, Yunho," San whispered in the man's ear. "Please."

San got on his knees as soon as he saw the nod. His fingers undid the pants and pulled them down. Right away, he began to lick.

Low groans left Yunho's mouth, making Jongho's tummy flip. That and the toy pushed him to the edge.

"Fuck. You know how much I like that, slut."
Jongho's eyes widened. San purposely hummed on the tip.

"Of course I do, Yunho," he commented. He licked down the shaft as his finger flicked the tip.

Then Jongho squirmed. "I... I need to cum."

Yunho brushed his hair. "Already?"

Jongho breathed in, then nodded. "Yes, sir."

"Ooh, sir? I like that, Jongie," San teased.

"Shut up and suck," Jongho spat back. San rolled his eyes and pushed his head deeper. Yunho held him still by his blonde locks until San couldn't have it anymore. The student left a trail of saliva as he removed his mouth.

"Strip," Yunho ordered. San did as told ecstatically. "Now, what should we do with you, baby?"

Jongho blushed a deeper red as Yunho stared him down.

"Rail him." San grinned.

"Jongho?" Yunho asked. Jongho thought to himself before nodding.

"Please, Yunho."

Yunho removed the silicone model and prepared himself to enter Jongho. Once he was ready, he slowly pushed in.

"Go fast," San advised while stroking Jongho's hair. "He's a big boy. He can handle it."

"San," Jongho whimpered. San lifted his chin and kissed him.

Yunho grew even more aroused at the sight of the two boys sensually making out before him. Hot air grew between their lips from the gentle moans leaving their mouths.

"Shh." San gently nipped Jongho's ear. At the same time, Yunho held Jongho's hips and began moving steadily.

"S-Sir..." Jongho moaned. He exhaled a tired chuckle to San as Yunho started going faster.

"Something funny, Jongho?" San kissed his cheek.

"My sexy health teacher is fucking me," he slurred. "The best fantasy I could've had."

Yunho's fingers settled on Jongho's hips. How it urged him to leave marks. So he did.

Jongho hissed as Yunho's fingernails dug into his skin. His arms hugged the edge of the desk for dear life, head down as he cried some more.

But Yunho didn't let him rest. Not even when Jongho was turned around to face him. Jongho's back touched the table as Yunho lifted his legs. San watched with arousal as Jongho's thick, tan thighs were licked by Yunho. His dick ached to be touched.

For Jongho, little strings of cum teased down his erected length. He whined when Yunho's lips came dangerously close.

"Cum if you need to," Yunho said.

"N-No." Jongho scrunched up his face. "I can hold it."

"Didn't we say that was bad for you?" Yunho leaned close. "Weren't you paying attention to my class?"

Jongho gulped from the closeness. Yunho smirked and kissed him.

"So cum for me, babe." Yunho suddenly pressed a hand against Jongho's abdomen, causing the boy to jerk and cry aloud. The man lapped the spurs of cum around Jongho's legs and hips.

"Back to your spot, slut." Yunho lubed up again and smacked San's ass.

Jongho was quick to notice San wasn't treated with as much care. Yunho held him down with San's bare chest on the table as he slid in.

His friend released a loud groan as he adjusted. But he got used to it quickly because he started panting and begging Yunho to go faster.

With a second hand, Yunho pressed San's head down on the table so he could only see Jongho.

"You see this, Jongho?"

"Y-Yeah."

"These are the type of friends you have? All cute to fuck?"

San whined beneath him. "A-Ah... Yunho... There! There."

"Is this what you'll become?" Yunho questioned Jongho. "A little toy?"

Watching San's half-open eyes and drooling mouth stirred something in Jongho. Sitting on the desk, he took the dildo and popped it in his ass again.

"That's how I like it." Yunho licked his lips.
San watched his breath reflect onto the table he was being fucked mercilessly on. His mind started drifting off as exhaustion took over his mind.

Yunho's movements became sloppy too. His body was tired. If he could, he would love to drop the session and continue tomorrow. But that wasn't possible.

Was it?

Yunho heard San loudly moan underneath him once he came. Pressing his pelvis against San's ass, he came deep inside the condom. How pretty these two whores would look with cum dripping out their asses. That's set for another day. For now, the two exhausted boys had to get home.

Jongho has given up thrusting the object inside him. It just sat there in his ass. Yunho slowly pulled it out and kissed him.

"Let me take you two home."

The following day San, Jongho, and Yunho reported being sick. Not because they were, but because San and Jongho had decided to spend the night at Yunho's.

Well, you can guess what happened there.