Title: H2O
Rating: PG-13
Genre: Humor, Romance, Fluff
Pairing: Yunho/Jaejoong, Yoochun/Junsu
Theme: Chemistry for
jaeho_challengeSummary: Yunho learns the basics of chemistry and how hydrogen and oxygen work together.
Mole: a unit, equivalent to 6.02x10^23
Stoichiometry: relationship between compounds in a chemical solution
Hyung: A word used by a boy to an older boy to show respect.
Hyung-deul: sort of a plural to “hyung”
Sonsaeng: Teacher
Sonsaengnim: what you would call a teacher if you were speaking to them.
-sshi: a suffix used formally if you do not know a person well enough, or to show respect. Sort of like calling someone “Mr. Jung.”
Oppa: title used by a girl to an older boy.
--
“…So when an acid encounters a base, they neutralize each other. Therefore, if you ever spill an acid, immediately neutralize it with a base and vice versa.”
Yunho sighs dreamily, head propped on his palms. Subtly, Junsu knocks Yunho’s elbows beneath him, causing the older boy to smack his face into the desk.
“Yah, Jung Yunho! Are you sleeping in my class?!”
With his dazed eyes and two bright red patches of skin, remnants of his palms pushing against his cheeks, Yunho stares admiringly at his teacher.
“N-no, Sonsaengnim!!” he squeaks. “I was just, uh, admiring these lovely new desks…!”
He eyes Yunho suspiciously. “I must admit, they are pretty sweet desks.” Yunho beams. “However, Jung-sshi, that does not excuse you from slacking off in my class!”
Yunho droops his head dejectedly. “Sorry, Sonsaengnim! I will pay attention from now on!” He bows his head repeatedly.
Clucking his tongue, he turns away and continues with his lesson.
“Of course, when measuring chemicals, precise accuracy is needed. Otherwise…”
--
“… and did you see Chae Yeon earlier?” Yoochun exclaims, slamming his hands onto the lunch table.
Junsu snorts half-heartedly. “How could you miss her?”
“Yah, what is that supposed to mean?!”
“He means shut up about girls already,” Changmin elaborates betweens mouthfuls of food.
“Yeah, Yoochun-ah,” Yunho agrees. “What we could be talking about is how beautiful Kim Sonsaeng is.”
“…”
“…”
“…Isn’t that your chemistry teacher?” Changmin asks.
Yunho nods with a wistful expression on his face.
“He’s like the wind… No, the sun! No! He’s like helium, and I’m oxygen! So perfect for each other!”
Junsu raises an eyebrow. “Hyung, oxygen and helium don’t really mix well together.”
Yunho pouts. “But-“
“Even I knew that, hyung,” Yoochun points out. “Honestly, you put Kim Sonsaengnim to shame. What would he say if he knew you don’t pay attention to his words!?”
Yunho’s head drops sadly.
“Yoochun-ah,” Changmin calls. “If you make him cry, his fan club will come after us.” He points to the gaggle of girls at the other table, all watching Yunho intently. They quickly turn their heads away and act innocent when Yoochun turns around.
“Yoochun-oppa, I love you!” a girl screams.
“…”
“…”
“…”
“Ahha!” Yunho exclaims, shooting out of his seat. “I will just have to pay more attention to what he says! I’ll woo him with his beloved chemistry! He’ll never be able to resist me!”
Junsu and Changmin exchange knowing looks as Yoochun pats his back reassuringly.
“You go get ‘em, hyung!”
“Don’t encourage him!”
--
“A mole is a unit.~ Oh, have you heard?~ It’s six point oh two times ten to the…twenty-third!~”
Yunho claps his hands enthusiastically when his teacher finishes singing the catchy tune. His efforts are met with silence.
Kim Sonsaeng’s cheeks flush lightly. “Thank you, Jung-sshi.”
Yunho beams proudly.
“Kiss ass,” Junsu coughs.
Yunho shoves Junsu’s face away. The teacher eyes him shrewdly.
“Don’t use violence in my classroom, Jung Yunho,” he reprimands.
Collectively, the class snickers. Yunho’s eye twitches as he folds his hands neatly on the desktop.
“Now, pay attention. The mole will be the basic unit we use…”
--
“Junsu,” Yunho whines. “I don’t understand. What do you multiply by?”
Junsu scoffs. “Why don’t you ask your precious Kim Sonsaengnim?” He bends further over his paper when Yunho tries to peek from his paper.
Yunho lights up immediately. “That’s a perfect idea!” he exclaims. As the librarian glares at him, he immediately lowers his head. “I’ll go ask him for some extra tutoring after study hall!”
The librarian shushes him sternly.
“So,” he whispers. “How are you and Yoochun?”
Junsu snorts. “Don’t even talk to me about that… that… pig!”
“Kim Junsu and Jung Yunho! Remove your persons from this library immediately!”
--
Yunho wails dramatically, repeatedly bashing his forehead onto his folded arms. Yoochun looks on worriedly while Changmin frowns intensely.
“Hyung,” Junsu says. “Did it not go well?”
Yunho jerks his head up and glares at Junsu. Standing suddenly, he grips Junsu’s shirt and shakes the younger boy.
“This is all your fault!” Yunho cries.
“H-how?”
“You told me to ask Kim Sonsaengnim for extra tutoring! But he assigned Changmin to tutor me instead!”
“Oh.”
“’Oh’ is right, Kim Junsu,” Changmin snarls. “Now I have to waste my free time teaching an idiot.”
“Hey!”
“Now, now,” Yoochun consoles, stepping in to mediate. “I’m sure Junsu didn’t mean for this to happen, so we should-“
Changmin interrupts him. “You’re only saying that because you want a piece of his duckbutt.”
“Well, who wouldn’t?!” Yoochun defends. Blinking, he reevaluates his words. “Wait, that didn’t come out right."
Junsu strokes his arm reassuringly. “It’s okay, Yoochunnie. No one can resist this ass.”
Grinning, Yoochun grabs a handful of said large object. He leans over and nibbles on Junsu’s ear. Giggling, Junsu turns around and captures Yoochun’s lips.
“Hyung, why do you torture me?” Changmin asks sadly, pouting carefully.
“Ah! Ah!” Yunho cries, launching forward to hug Changmin. “I’m sorry! I’ll talk to Kim Sonsaeng and get you out of this!”
As Changmin pats Yunho’s back and thanks him quietly, he smirks naughtily, silently praising the magnanimous quality of his pout.
--
“Kim Sonsaengnim, can I speak to you?”
The teacher looks up from his lunch, frowning when he sees Yunho. Swallowing his mouthful of bibimbap, he gestures to the seat across from him.
“What is this about, Jung-sshi?”
“You assigned Changmin to tutor me, but I think he’s far too busy to do so.”
He nods absentmindedly.
“And I think I’ll learn much better from you personally,” Yunho continues, staring at his teacher expectantly.
“Oh, you’re done,” he replies. “Well, I’m afraid I can’t help. I’m not paid for any time spent after school hours.”
“I’ll pay you!” Yunho exclaims suddenly.
Amused, Kim Sonsaeng smiles as he returns to his food.
“I’m afraid I can’t take money from students.”
“It’s not against the rules,” Yunho argues.
“It’s more of a moral issue, Yunho-sshi. I won’t take money from anyone younger than me.”
“B-but-“
He sighs. “Well, I will agree to tutor you for now. I will think of a suitable payment afterwards. Meet me here after school. If you are late, I will leave.”
“Yes, Sonsaengnim!” Yunho smiles and flips his fingers into a peace sign.
--
“So multiply this by 3.67 and divide…”
Yunho squints at his paper and sticks out his tongue in concentration.
“So what about this? Yunho wonders, pointing the tip of his pen at the paper.
“Hmm?” Kim Sonsaeng stares at the problem. “Where did that come from?”
Yunho laughs, the low sound bubbling in his throat with a rumble. Kim Sonsaeng watches him strangely, swallowing stiffly as he watches the bulb of Yunho’s larynx bob with every throaty chuckle.
Awkwardly, he clears his throat. “Yah, Yunho-sshi, I think you did your math wrong.” He laughs and pokes the younger man in the cheek.
“What? Impossible!”
Frantically, Yunho checks his work, then pauses when he sees his teacher giggling behind a pale hand.
“Wah~ Sonsaengnim!”
He smiles in reply. “I feel uncomfortable with you calling me that. Call me ‘Jaejoong.’”
--
“He asked me to call him by his given name!” Yunho cries into the phone. “Wah~ Jaejoong. What a beautiful name!”
“Teehee. Yoochun, stop that. It tickles!”
“Jaejoong,” Yunho continues, testing the name on his tongue. “Jaejoong, Jaejoong, Jaejoong.”
“Mmmm… Chunnie…” Slurping noises. “Yoo…chun…”
“I wonder what he would do if I kissed him.”
“Yoochun!” The line clicks.
“Jaejoong. So sweet on the tongue. Hey Junsu, you’re going to help me, right? Junsu??”
--
“…go over more stoichiometry for you approaching midterm…”
Enraptured by the pout of Jaejoong’s lips, Yunho hardly pays attention when the young chemistry teacher approaches and slams his palms onto the desktop.
“Jung Yunho, you better be paying attention in my class!” he roars.
Yunho jumps in fright, staring up at his teacher with wide, alarmed eyes.
“Jung-sshi, I will not waste my time tutoring you if you can’t even pay attention in class.”
“Sorry, Sonsaengnim, I’ll try harder,” he says, bowing his head.
Junsu snickers behind his hand. Jaejoong’s eyes snap to him.
“You better be paying attention as well, Kim-sshi.”
Junsu’s face drops, and Yunho smiles widely.
--
“He yelled at me, Chunnie!” Junsu wails, clinging onto the older man.
“He did not yell at you,” Yunho says.
“Whatever, hyung!” Junsu cries. “You just want in his pants!”
Yunho freezes. “Be quiet!” he hisses, covering Junsu’s mouth.
“What? It’s not like he can hear… right?”
Behind Junsu, Kim Jaejoong stares in shock.
“Uh, hyung-deul,” Changmin says, nodding toward a point behind them.
Slowly, they turn around to face the older man. Jaejoong swallows roughly, then extends his arm and places a phone on the table in front of Yunho.
“You left your phone in my class, Yunho-sshi.” His hand twitches as he pulls away. Biting his lip, Jaejoong turns away.
“Sonsaengnim!”
“I’ll speak to you later, Jung-sshi.”
--
“Oh God, it’s all your fault, Junsu!” Yunho cries, nearly pulling out his hair.
“I’m sorry?” Yunho shoots his arm out to grab him. “EEK! Chunnie, protect me!” he shouts, running to hide behind Yoochun.
“Hyung,” Changmin says. “I’m sure it’ll be fine.” He pauses. “Kim Sonsaengnim is very pretty.”
“What do you know?! He’s mine!!” Yunho cries, flailing his arms.
“…”
“…”
“Chunnie, I’m scared. Yunho hyung is scary.”
Yoochun pats the firmness of Junsu’s bottom. “Our hyung is in love, Junsu-ah.”
“Love is frightening then,” Changmin says.
“Wait till your time comes,” Junsu warns. “But we never had that. Right, Chunnie?”
“Of course.”
“Really?” Changmin asks. “I distinctly remember Chae Yeon’s locker covered in profanity…”
“Purely coincidence.”
Yoochun nods in agreement.
“Riiiiiiiight.”
Yunho bangs his head against his locker. “He’s going to hate meeeeee.”
Changmin punches his arm, and Yunho cries out, gripping his bicep with his other hand.
“Be a man. Kim Sonsaeng doesn’t want a boy. So suck it up and go talk to him.”
“You’re right.” He nods as he examines the bruise blossoming under his fingers. “I’ll go now.” He nods again. “Yeah.”
As he walks away, Junsu folds his arm and watches his back.
“He’s so dead.”
The other two nod in agreement.
--
“It’s against the rules, Yunho-sshi,” Jaejoong says, dropping his head. His hair falls and obscures his face. “Please forget your feelings for me.”
“That’s not something you forget, Sonsaengnim,” he replies.
Jaejoong shuts his eyes. “Please don’t call me that.”
“Why?” Standing up, Yunho approaches his teacher slowly. “Because you don’t want to be called that? You want something more?”
“Jung-sshi…”
Gripping the armrests of Jaejoong’s spinning chair, Yunho leans over and brushes his lips against his teacher’s.
“Call me ‘Yunho.’”
Jaejoong opens his mouth to Yunho’s tongue, moaning softly as he raises his arms to wrap around Yunho’s neck. He pulls the younger man into him, caressing Yunho’s tongue with his own.
“Jaejoong…”
Licking his lips, Jaejoong gazes up from beneath lidded eyes.
“I’m not sure we should…”
“Think of it this way.” Yunho drops his lips to Jaejoong’s slender neck. “You’re like oxygen, and I’m like hydrogen. Potent when apart, but together make H2O. And everyone needs water, right?”
Behind a small hand, Jaejoong giggles, the corners of his eyes crinkling in happiness.
“Well, I’m glad I taught you something.”
Grinning naughtily, Yunho nips the skin beneath Jaejoong’s jaw.
“You can teach me so much more, Sonsaengnim.”