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He knew he shouldn't look forward to it. He should get the boy transferred out of his class. Make up some reason, any reason. It wasn't like he was the best physics student ever. He'd do better in a lower-level class.

But he knew he wouldn't do any such thing. When fourth period came around, his heart started beating faster and his palms began to sweat. The pavlovian reaction was infuriating, but he was helpless to stop it. He didn't quite know when it had gotten this bad. He dreamed of him now. He was obsessed.

The students began to filter in, and part of him hoped that the boy would be absent. Maybe he had a cold, or had decided to skip for the day, or something. And he would be able to teach just one class without having to worry about his erection showing.

But that was only part of him. The rest of him was waiting for the first glimpse of him.

And there he was. His heartrate elevated even more and his cock began to stiffen. He tried not to look, he really did. But, as with everything else connected to the boy, he was helpless. He could sense him, and with just a peripheral glimpse he knew he was wearing *the* jeans. The jeans that hugged his firm little ass perfectly, and were so worn that they clearly showed every detail of the boy's developing body. And he had to look. He tore his eyes away from the boy's crotch with effort, and up over the black tshirt that was just slightly too tight. To his face. Those full lips, that he liked to bite at when he was thinking hard. White, even teeth that he showed when he smiled, which was often. And those eyes, brilliant green that wasn't hidden at all by the retro glasses.

He felt his face colour with a start. Those eyes were looking back at him, and his expression was one of knowing amusement. "Good morning, Professor Snape," he said, his voice low and breathy as he passed his desk deliberately.

"Good morning, Mr. Potter," he answered automatically, his voice deeper than usual as he fought not to caress the syllables of the boy's name with his tongue. Damn boy. He knew.

The rest of the class filed in, shuffling papers and slamming books down, preparing for the class. But Harry just sat there, smirk on his face, legs parted slightly. He always sat in the front row, so Severus had an unobstructed view of him. Heaven and hell, all wrapped up into one. His personal Lolita. The problem was, he wasn't sure if he would change a thing even if he could.

Professor Snape began his lecture, writing on the board in precise script, and soon equations were flowing across the board as the class struggled to keep up. He was constantly aware of Harry, though, as the boy shifted in his seat, parted his legs a bit more, and almost casually slipped a hand into his lap.

Severus' heart hammered in his chest and he actually forgot what he had been saying for a long moment. Harry wasn't... he couldn't be... but he realised that from that angle, the only person who could see what Harry was doing was him.

He cleared his throat for a moment and looked down at his notes. When he looked up again, Harry's hand was no longer in his lap, but the boy wore a satisfied smirk. He knew what he'd done.

Severus went back to his lecture, and for the rest of the class he never looked directly at Harry.

When class was over, a couple of students lingered to ask questions; this was the last period before lunch so they didn't have another class to rush right off to. He sat behind his desk and answered, until they'd all filed out.

Except for one.

He swallowed hard as Harry approached the desk slowly. Severus was pathetically happy the solid wood was between him and the boy. How could a sixteen year old boy affect him so?

"Can I help you, Mr. Potter?" His voice, at least, showed none of the shakiness of his hands.

The boy's laugh was pure sex, and shouldn't have been possible from a teenage boy. "Oh yeah, you can help me, *sir*," he breathed. He set his backpack down and walked closer. Somehow the door had gotten closed.

He went from pale to flushed at the tone of Harry's voice. "Please, do enlighten me," he said, trying for an acerbic tone but only partially succeeding. He was known for his dry wit and biting sarcasm, but with Harry his intellect fled.

"I have a *problem*," Harry breathed, stopping in front of Severus' desk.

"I'd be happy to help you with a physics problem," Severus answered as calmly as he could.

"Oh, it's not a physics problem," grinned Harry, running his hand through his perpetually mussed hair. Then, almost casually, his hand travelled down his lean body.

Severus' eyes followed that hand helplessly. He wondered just when he'd lost control of this situation. Probably the first time Harry had arrived in his class.

Harry had arrived in the middle of term; not an unusual circumstance, but it meant he was behind in several of his subjects, physics included. The boy had come to him after the first class to ask for help.

Severus had noticed the handsome boy, of course, the moment he'd walked in. Physical perfection like Harry's was hard to ignore. But he'd disregarded it immediately; he was no paedophile.

But Harry was no child.

Perhaps his body was sixteen years old, but his mind... his libido... was not. It was no excuse, but Severus fancied he could smell him as he approached the desk.

Harry asked for help, and Severus offered to assign him a student to tutor him. There were several students in his advanced classes who would have no problem teaching Harry the rudiments.

But Harry had other ideas.

"I want you, Professor Snape," he'd said in a breathy voice that made Severus' mouth dry as the desert. A pause that had Severus gaping, then he added, "To teach me."

Harry went on to explain that he found it difficult to learn from fellow students; he had a learning disability that often frustrated them. All the while Severus was still reeling, and he agreed without argument. He couldn't escape the feeling of being toyed with. But he arranged a weekly tutoring session.

Each session was hell. Harry leant close; he smelled of some exotic scent that Severus couldn't put a name to but he suspected was completely natural. He bit his perfect lips. He casually put a hand on Severus' shoulder.

But Severus held fast. This was a boy, a teenager, a child. Anything he was imagining was just that. Imagination.

But Severus began to question that. Harry rubbed against him. Licked his lips. Stared back at Severus with soulful eyes. Practically sat in his lap. Each session left Severus painfully hard and frustrated. And confused.

He knew he should assign someone else to tutor Harry. He didn't even have to explain it. He could just do it.

But he didn't. Something inside him liked the torture. The wanting. The ache.

Severus snapped back to the present as Harry toyed with the hem of his tshirt, pulling it up to reveal a tantalising slice of pale hairless skin. He swallowed hard. "If it's not a physics problem I'm afraid I can't help you," he said, mustering authority into his voice.

"Oh but I *know* you can, Professor," Harry replied, dropping his hand to press on his... Severus swallowed hard and every drop of blood left his brain as Harry touched himself through his jeans.

"Harry... Mr. Potter," Severus sputtered, face flushed and cock aching once again.

"But Professor, I have this problem... and I know you can help me with it. You're the only one I want to help me with it." The boy pulled up his shirt so Severus had an unobstructed view of the bulge in the boy's jeans. "It's my birthday," he added helpfully.

Severus was still gaping. His arousal made his brain work more slowly than usual, and Harry went on. "That means I'm seventeen. Over the age of majority. The age of choice. I can choose to have sex now. With *anyone* I want."

"Oh fuck," Severus blurted, and Harry's laugh was magical.

"Exactly what I had in mind, actually," he purred, unzipping his jeans and sliding his hand inside his boxers.

"Harry... you mustn't... we can't..." His protests sounded weak even to his own ears, and Harry obviously didn't take them seriously.

"But we *can*," he insisted. "It's completely legal." His hand snaked further down, wrapping around his arousal. Severus' cock pulsed hard.

"But... it's immoral," Severus said, pressing against himself lest he come in his pants.

"That's the fun part," Harry smirked, his voice dissolving into a moan as he gave himself a quick stroke. "Don't tell me you're not hard for me right now, Professor. Don't lie."

Severus had no answer to that.

Harry seemed to take that as an invitation, and slowly he walked around the desk toward his teacher, hand still wrapped around his length. His eyes dropped to Severus' lap, and he smiled. "See? You want me. I want you. It's simple."

Severus stared up at Harry, unable to think of a coherent argument why he should not, indeed, give Harry the birthday gift he was asking for. He felt unequal, so he stood quickly, towering over Harry by at least six inches. It made him feel better. Stronger. And unfortunately, no less aroused.

"Oooh," Harry moaned, looking up at his professor. "You're so sexy, sir. I've been thinking about this for ages."

"Have you?" Severus responded hoarsely, trying to wrap some dignity around him. But he was too turned on to manage it.

Harry nodded solemnly. "Since I first met you, I wanted you. To be my first." He grinned. "And I was patient. I waited. I only teased a little." His voice was breathy and music to Severus' ears.

Severus couldn't help a chuckle. At least he hadn't been imagining anything. "Only a little." That little bit had nearly driven him insane.

"I had to be sure," Harry went on. "That you really wanted me." The boy looked up at him so directly, so frankly, that Severus was moved. How could this gorgeous boy doubt himself so?

He made a decision then. Harry was indeed old enough to choose. And though he might lose his job, he wasn't breaking any laws. So he reached out and took Harry's hand and placed it on his erection. "I wanted you from the first time you walked into my classroom."

A smile lit up the boy's face and Severus fancied he felt the warmth from it. "Really?" he breathed, and without waiting for an answer he launched himself at the older man.

Severus caught Harry, and moaned softly as he felt the boy against him at last, his warm soft lips on his own. It felt better than anything had a right to. Harry's body was slender and firm and the hard bulge against his thigh made his own cock pulse.

Harry's kiss was inexperienced; Severus could tell that the boy had little or no practice at it. But he didn't care. He parted his lips, guiding the boy to deepen the kiss, and soon Harry got the idea. They kissed, a little sloppily but the boy wriggling against him was well worth it.

Finally Harry pulled back, cheeks flushed as he panted. "Oh god Professor. I want you so much."

Severus gazed into Harry's eyes, and knew he wasn't going to refuse. If there was a hell, he deserved to be there, because he wanted Harry more than he'd ever wanted anyone or anything. He hadn't allowed himself many indulgences in his life. But this one, he would take.

"All right," he breathed, sealing his fate.

"You won't regret it," promised Harry, and he stepped back, fumbling with his clothes.

Severus was alarmed. "Not here!" He glanced up at the door, realising that they'd already been lucky not to have been caught.

Harry pouted. "But I want it here... I've thought about it so much... I want to bend over the desk..."

Severus whimpered. "I'd like that a great deal as well," he whispered. "But anyone could walk in now."

Harry brightened. "After school then? I'm to have a tutoring session with you anyway..."

Severus nodded. How he would get through the rest of the day knowing what would happen after school, he didn't know.

Harry pressed one more sweet kiss to Severus' mouth, then he danced away, eyes twinkling. "See you after school."

The day dragged on. Finally the last class was over, and all the students filed out. Severus sat behind his desk, gazing at the door. He fully expected Harry not to show up.

But not two minutes after the room had cleared, the door creaked open again. A dark-haired head peeked through, followed by the rest of Harry, grinning brilliantly. "Hello Professor," he breathed, glancing around the room and finding it deserted. He turned to the door and shut it firmly, turning the lock. He dropped his rucksack to the floor and advanced on Severus.

The look in Harry eyes made Severus feel like prey. Harry might be young, but he clearly knew what he wanted.

And for once, Severus was not about to argue the point.

By the time Harry got to the desk, his shirt was off and his jeans were gaping open. No undergarments were visible beneath and Severus moaned softly. "Harry, I..."

But Harry just shook his head, silencing any protests that might have been forthcoming. "No more talking. Unless it's to tell me just what you're going to do to me." He licked his lips. "Now that would be hot."

Severus' cock was ready to drill a hole through his neatly pressed trousers, and it was all he could do to speak clearly. "I was going to tell you to lock the bloody door," he ground out.

"Oh," Harry brightened, and said, "Already done."

Severus knew that wouldn't ensure their safety but at the moment he couldn't bring himself to care. As hard as he was, this surely wouldn't take long anyway.

Now Harry was in front of him, pushing his jeans down slender hips and strong legs and Severus' eyes came back up almost guiltily to look at the hard flesh jutting straight up against the boy's belly. Large for his age, rock hard and perfect. Harry was aroused for him. It was still too much to believe.

"Please sir. I want you. Take me."

A moan escaped Severus' lips before he could stop it, and he whispered, "Are you sure..."

Harry nodded impatiently, impertinently. "Told you. I want you to be my first. So I'll always know what a real man feels like."

Severus nodded. No one could be expected to refuse such a request, not from his own little fantasy. "Come here. We shall do this my way."

"Fine," breathed Harry, rounding the desk quickly. He clambered up on Severus' lap without waiting to be told and wrapped his young strong arms around him. And not incidentally pressing the curve of his ass directly against Severus' aching arousal.

"Harry," moaned Severus, and leaned in to capture Harry's sweet mouth once again.

Harry kissed back, though he squirmed a little impatiently against the older man.

Finally when the kiss ended they were both flushed. "Lean over the desk," Severus instructed.

Harry complied quickly, and suddenly Severus had a thought that made his heart skip a beat. "We don't have any-"

But Harry was far ahead of him. "Jeans pocket," he groaned, settling himself into a more comfortable position, legs spread and delicious ass raised in the air.

Severus raised an eyebrow but didn't argue; he reached into the boy's front pocket and found a condom and a small tube. "You came prepared," he observed, not unkindly.

Harry actually giggled. "Yeah. And now we're going to come. Hurry. Please."

Severus let the bad pun go just this once considering the circumstances, and he unbuckled his trousers. At the sound of the zipper lowering, Harry whimpered and squirmed on the desk, looking back over his shoulder.

Severus allowed himself a smile at Harry's eagerness, then he moaned as he slipped on the condom. It had been some time since he'd been with anyone, but the feelings were not easily forgotten. He slicked the condom, then moved behind Harry. He knew he should prep the boy but he didn't think either of them could take the wait. "Try to relax," he whispered before pressing the blunt head of his cock at Harry's opening. He could feel the heat of the boy's body even through the latex and he bit his lip.

"Oh god oh please just do it," Harry begged. "I can take it, I want it, please..." He shoved back, forcing Severus' cock into him, and then let out a lusty groan. "God, so big, so good, yes please..."

Severus cried out at the sudden excruciating friction, and he continued the slide inside him until he was fully sheathed. He was breathing hard, fighting back the urge to pound hard and come immediately. "Harry," he gasped, his voice showing the strain. "Tell me if it hurts too much..."

"It doesn't, it feels amazing, please just fuck me!"

So he did. Pulling back with as much grace as he could muster, Severus thrust back in just a little harder. He focused on the rhythm of the act to keep it from ending too soon. Harry took every bit of it, asking for more and pushing back against him. Soon they were going full out, Severus grasping Harry's hips and driving in and out with a precise rhythm that stunned even him.

But Harry soon began scrabbling against the desktop. "Oh god, so good sir, please just a little more..."

"Stroke yourself," Severus suggested through clenched teeth, and he could tell when the boy did, because his whole body seemed to seize up around him and he cried out shrilly. From the rhythmic pulsing of his muscles Severus knew Harry was coming, and then he let himself go as well.

The intensity of his climax almost made his heart stop. He'd never felt anything quite this good, he was sure of it, and he forgot his own name for long moments.

He came back to his senses, slumped over Harry's back. He raised his head to see the boy smiling sleepily at him. "I don't s'pose I could just have a bit of a nap right here, d'you think?" Harry asked.

Severus smirked. "I doubt the cleaning staff would appreciate such a mess," he advised, pulling out of the boy carefully. He waited for the inevitable guilt to hit, but curiously it didn't. "Are you all right?"

Harry giggled again as he stood up gingerly. "Good thing I don't have to ride a bicycle right now," he replied, leaning back against the desk still provocatively naked. "But yeah. I'm great."

"That you are," Severus agreed, the words slipping out as if on their own.

Harry laughed. "The least you can do is give me a lift home," he went on.

Severus sighed. "Indeed. The least I can do."