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A triumphant feeling spread through Harry's chest when he saw Draco stealthily looking around to his left and right before handing Snape something that Harry couldn't quite make out.
Was it a potion, perhaps?
Harry crept quietly a little closer under the protection of his Invisibility cloak. He had known all along that Draco was up to something. He had feared since Christmas that Snape was also involved. But now he had certainty. And all of this right under the nose of Albus Dumbledore, who kept trying to assure him that he should trust Snape. Pah, he would prove it to everyone that he had been right. This time Ron and Hermione just had to believe him.
The Potions Master had a greedy look in his eyes as he looked down at what Draco had given him.
"Thank you Draco, but please be more punctual next time. I was getting impatient and I don't want you out on your own after curfew. Wait here." the man said reprovingly and turned to put what he had received down in his rooms.
Now or never, Harry thought to himself, and as silently as he could, he scurried through the open door after Snape to find out more. He saw Snape place a bottle in a drawer of his desk and the very next moment he had to squeeze into an alcove to avoid the potions master, who returned to the door.
"I'll walk you back." said Snape.
"I'm not a little kid anymore!" Draco protested, but that was all Harry heard as the door slammed shut, leaving him alone in the room. What a happy coincidence. At last he now had the chance to find a proof that Draco was behind the attacks. Then this criminal would finally be expelled from the school and if things went well, he would be rid of Snape right away.
He quickly went to the desk and looked for the right drawer. There were just far too many drawers, filled with writing utensils, essays and documents, as well as small and larger ampoules and vials.
His fingers itched to have a good look around. To invade Snape's privacy and learn more about the man. Maybe he would even find the Death Eater mask. The idea aroused an interesting mixture of disgust and curiosity in him. But that would have to wait. For now, he wanted to know what Draco had secretly brought to Snape so late at night.
He finally found what he was looking for in the 5th drawer and excitedly pulled out the bottle. It was still slightly warm, but unfortunately not labelled. How was he supposed to find out which potion or ingredient it was? Especially as his knowledge was rather modest, though much better since he had his nose in the Half-Blood Prince's book every minute he wasn't spying on Draco or Snape.
He removed the cloak that had only hindered his search and held the bottle against the flickering light of a torch on the wall. The liquid was blood red and flowed viscously back and forth in the bottle when Harry moved it. Should he risk opening the bottle? What if it was cursed or poison?
On the other hand, Draco and Snape had also handled it relatively carelessly with their bare hands, so it couldn't be too dangerous. He decided that he would open the bottle to bottle himself a small amount, which he would then have examined later. Surely Slughorn would be happy to help him out, as long as it involved potions.
He took the bottle and pulled the tightly fitting cork with his other hand. A noise in the hitherto dead silent room startled him. He wheeled around and saw that it was only from a bat that had come fluttering in through a small window, but he had been so startled that the bottle slipped from his fingers and shattered into a thousand shards on the stone floor. The red liquid splattered around so that Harry's shoes and the desk were also full of splashes.
"Oh, bloody shit." cursed Harry. How was he going to fix this? A metallic smell rose to Harry's nose and now he was sure what had been in the bottle. Blood. Why the hell was Draco bringing blood to Snape?
"How dare you, Potter?" growled a voice all too familiar behind him, in a tone that almost made his blood run cold.
Harry whirled around and looked in shock at the angry face of Severus Snape, who was standing full height in front of him and was looking at him menacingly. His nostrils had flared and there was a fire sparkling in his eyes that actually scared Harry a bit.
"I...I'm sorry..." stammered Harry hastily.
"You're sorry?" repeated Snape with a sneer. "You're trespassing after curfew. You break into my rooms, rummage through my belongings and destroy something so important, putting the students here in danger and you really think you can get away with that with an "I'm sorry"? You've really gone too far this time, Potter. I can finally have you thrown out of school for this."
Harry felt a shiver run down his spine. But he had always been much braver than intelligent. And so he said, "I saw Draco bring you the bottle. The way he was acting, I don't suppose you want anyone to know about it, do you?"
"Are you threatening me, Potter?" asked Snape dangerously quietly.
"Why is Draco bringing you blood?" asked Harry boldly, to which the Potions Master gave him a snide look.
"Really, Potter? I knew you were slow on the uptake, but the fact that you still don't get it with all your observations is pathetic even by your standards."
Harry frowned. Draco had brought Snape blood. Snape had suddenly appeared here, although Harry had been alone, apart from a bat that had fluttered into the room. Where was that one, anyway?
And then all the cogs finally clicked into place and he understood. So the rumours had been true all along!
"You're a vampire?" whispered Harry in awe, and the wry smile on Snape's face confirmed his thesis once and for all.
"Oh yes, Potter. And not only that. I'm a very hungry vampire whose food was destroyed by some idiot who is now here all alone probably without anyone knowing about it. And since it's been over a month now since my last proper meal, it's getting harder and harder to suppress the urge to drink directly from the source."
Harry swallowed as he saw the gleam in Snape's eyes and for the first time he truly realised the danger he was in. Here they were no longer student and teacher, but he was a potential victim facing a hungry and angry vampire. A self-inflicted danger, he remorsefully had to admit.
"And Draco willingly gives you blood because he knows the truth?" asked Harry, trying not to let on how nervous he was.
Snape tilted his head. "He gives me his blood because he owes it to me."
"Because of the Unbreakable Vow." concluded Harry proudly.
Oh yes, it was all beginning to make sense.
Snape raised an eyebrow. "Amazing how much more you know than is good for you. Your curiosity will get you killed one day if you don't stop putting yourself in dangerous situations all the time."
One day? That reassured Harry, meaning that Snape wasn't planning to kill him here and now.
"Will it hurt?" asked Harry excitedly.
Snape frowned for a moment until he understood what Harry was talking about.
"So you've already accepted that you'll have to make up for the damage you've done?"
"I'm not one to shirk my responsibilities," Harry said firmly, standing up straighter. "But I hope this doesn't turn me into a vampire too?"
"That would be richly pointless, wouldn't it, turning every victim into a vampire with whom you have to compete for food? No, there's more to it than that." Snape explained and Harry wondered involuntarily when Snape had become a vampire. He was clearly a changed and not a born vampire, or he couldn't fool everyone around him with his human appearance. Besides, he had seen Snape eat real food before. But Snape would probably laugh at him rather than answer such a private question.
"Does it hurt to be bitten?" asked Harry instead.
"Only at first. There are enzymes in the saliva of a vampire that make it more bearable and ... pleasant. However, you might not like the effect. Or rather, you won't like the fact that you like it. That's the reason I only drink Draco's blood bottled."
Harry blinked in confusion, not knowing exactly what Snape meant.
"Would you rather I bottled it too then?" asked Harry nervously.
"No, No. It's so much more effective and thirst quenching when you drink it fresh from the vein. And a punishment is necessary, don't you agree? Besides, it's been ages since I've been able to do that." Snape murmured darkly and Harry's heart raced as he saw the greedy desire burning in the vampire's eyes.
His gaze fell on Snape's mouth, where he could actually spy the side of a long and sharp tooth. Harry's thoughts flashed over as he realised that it was really about to happen.
He felt himself unconsciously getting hard and turned around, embarrassed, hoping Snape wouldn't notice. Was he a pervert or was this normal, that the prospect of being bitten by Snape excited him? On the other hand, he was a teenager and he had noticed for some time that he had a weakness for interesting men, so it shouldn't really surprise him.
Snape stepped behind him and Harry shivered with excitement as he tilted his head to one side to give the vampire better access to his neck. Harry did try to think of anything turn-offish, but even the thought of Filch and Minerva mucking out a stable naked wasn't enough to counter his erection. It was far too intimate and stimulating to expose himself so completely to Snape.
He felt the Potions master's breath over his skin and the next moment a wet tongue slowly licking the crook of his neck. Harry inhaled sharply and bit his lips to keep from letting any more embarrassing sounds escape that might tell Snape what effect he was having on the Gryffindor. Snape's arm came around Harry and he put his hand to rest directly over Harry's heart.
"How beautifully excited your heart beats!" sneered Snape. "That's excellent for good circulation." At that, he almost purred the words in such a seductive tone that Harry was convinced the man could probably bring him to orgasm with his mere voice, standing behind him like that, murmuring the right words into his ear.
Harry felt a slight stinging pressure on his skin and the next moment Snape's teeth dug into his neck as he bit down. It was a sharp pain and Harry gritted his teeth to keep from crying out, but only a few seconds later he noticed how the pain actually subsided. Instead, Harry felt pleasure seem to rush through his veins. Straight to his cock, which grew even harder.
The more Snape drank of his blood, the more Harry felt how aroused he was. His hands were shaking because he was so desperately suppressing the impulse to touch himself. It was pure torture for Harry and he felt his pelvis thrust forward of its own accord in a vain search for the friction he craved.
He could no longer suppress his desire and unobtrusively tried to move his hand to his throbbing length to stroke himself. But Snape noticed and Harry heard him chuckling, which gave the Gryffindor goosebumps.
The next moment Snape's free hand was on Harry's groin and he pulled him forcefully against his body. Harry could no longer suppress his moan as he could feel not only Snape's long fingers stroking his cloth-covered erection, but also an unmistakable hardness pressing against his ass. Snape was hard, too. And wasn't that a truly intoxicating thought, that he, Harry, was responsible for this?
He stretched his bottom backwards and let it gyrate against Snape's erection. The vampire gripped him tighter and began rubbing himself against Harry as he continued to massage the Gryffindor's crotch with a firm grip.
"I want more." moaned Harry, who felt like he was going to go insane if he didn't come soon. "Would you... Could you...?" he begged.
Snape pulled his teeth from Harry's neck and licked at the wound while some of the Gryffindor's sanity returned.
"What exactly do you want, Harry?" the vampire purred in his ear.
"To come... while you're inside me. Your teeth in my neck and your cock in my ass. I want you to fill me with your cum while sucking my blood at the same time." Harry confessed and received a deep groan in response.
"Such a filthy mouth..." murmured Snape appreciatively.
The Potions master reached for his wand and a moment later they were both naked and Harry grinned as he felt the familiar sensation of a preparation spell in his backside.
"Are you sure?" asked Snape cautiously and Harry almost laughed. As if he would really be able to say no, when he could already feel the wet glans of Snape's member promisingly against his anus.
He only wanted one thing.
Finally more!
Finally knowing what Snape would feel like inside him, finally experience the usually controlled man in ecstasy, finally chasing his own climax.
"Do it already, please!" begged Harry impatiently, and Snape complied with his request almost immediately, sinking deep into the Gryffindor with one powerful thrust. Harry groaned loudly. Snape's cock was bigger than what he had been used to from his classmates so far, but felt all the more perfect inside him.
The vampire hardly gave him time to get used to the stately size, but soon withdrew a little to fill Harry completely again with one thrust. It felt great, especially when the long fingers wrapped around his naked erection for the first time, teasing him further with deft movements.
Who would have thought that Snape, of all people, could give him such pleasure? He definitely had to make sure that this wouldn't be the only time. However, he was finding it extremely difficult to concentrate on any plans for the future at the moment. Harry was far too aroused and felt that he would not be able to hold back his orgasm much longer.
He put his head to one side and almost instantly the vampire was driving his teeth through his skin again. The intoxicating feeling returned and clouded his senses again. His head felt so light, as if he were floating and he could no longer think, only feel and enjoy. He was only peripherally aware of his orgasm overtaking him and then everything went white.
When Harry next came to, he was lying on a sofa in a room he had never seen before. He felt exhausted but somehow still satisfied and when his memories came back he also understood his condition and grinned. What a brillant evening. Harry tried to sit up, but it was more difficult than he thought. Now he also noticed the headache and pressed a snow-white hand against his forehead.
He heard footsteps and when he looked up, he saw Snape coming towards him with two vials in his hands, eyeing him with a strange expression on his face.
"Blood regeneration potion, drink them both at once." Snape ordered him as he held out the two potion vials to him.
"Does it always feel like this?" asked Harry as he reached for the vials.
A guilty expression flitted across Snape's face and he turned away. "No. I may have drunk a little more than I planned." the vampire admitted.
"Oh, I see." replied Harry, finishing both vials to have something to do. Somehow the atmosphere was too tense for him, but what could you expect when you went to bed with your professor... Although they had never made it to bed, but maybe next time. If he managed to convince the potions master to repeat the whole thing.
Harry noticed how the potion slowly took effect and he felt stronger again. But at the same time, he was getting more and more annoyed by this burdensome silence and he could feel himself getting angry. He was not someone who liked to endure such a mood without saying anything.
"Do you want me to apologise or what?" asked Harry belligerently as he jumped up because he couldn't take it anymore. Snape looked at him in confusion.
"What, no. I should have been more in control of myself. It's just hard when I'm this hungry." the vampire explained to him.
Harry didn't know why exactly, but that answer only made him angrier.
"So you regret it." he concluded with a bitter undertone.
"You don't?" asked Snape in surprise.
Harry bit his lip. The honest answer would be an unequivocal yes. If he could repeat the evening, he probably wouldn't change a thing, because, looking back, he was very pleased with how things had turned out. But admitting that to the Slytherin would be like handing his enemy an extra weapon.
"I could keep everything that happened today to myself if it makes you feel better," Harry offered instead. "On one condition, though."
The Potions Master eyed him suspiciously and asked, "What do you want?"
"That you don't talk to anyone about it either and..." he paused for a moment. "I want to be allowed to come back next month."
There.
Now he had said it. Now it was up to Snape. The latter, however, looked at him transfixed. "Come back for what?" the Slytherin asked slowly. Harry rolled his eyes. Typical Snape. Couldn't he just say yes or no?
"This." replied Harry gruffly, making a circular hand gesture back and forth between them.
"I'm afraid you'll have to be more specific, lest we misunderstand each other." said Snape, some of his usual mockery having returned to his voice. Harry gritted his teeth. Snape was such a bloody sadist. Of course he would make him say it, just to humiliate Harry.
But that didn't change the fact that he would probably have to bite the bullet if he wanted to get what he desired.
He took another deep breath, then said as quickly as he could "You get my blood, I get sex. So?"
"Why?" questioned Snape.
Harry was so close to wringing the Slytherins neck.
"I mean why would you want that? Surely you have plenty of opportunities to get what you want in the castle?" Snape specified.
Harry sighed.
"You really want to hear it, don't you?" he asked reproachfully. "So if you need to know... The sex with you has been mind-blowing, better than what I've had so far and I can't bear the thought that it was just a one-off."
The look the Slytherin gave him in response was so intense that Harry struggled not to look away.
"I don't think you know what you're getting yourself into. You can come back next month for all I care. But I warn you, if you plan to continue this beyond that, we're going to have to have a proper conversation about what our standards are for each other. I have no interest in playing games and I won't share what is mine."
Harry's heart skipped a beat when he heard the possessive tone.
"I wouldn't have a problem with that, but honestly then once a month isn't enough for me." Harry said boldly.
The corners of Snape's mouth twitched as if he had to stifle a smile. "Well, you've got a month to think about what you want then."
"I will." Harry promised with a smile. "But first I should get back to my tower."
"I'll go with you." said Snape in a tone that made it clear he would not discuss it.
Nevertheless, Harry replied, "There's no need. I have my cloak, after all."
"Hmm, strictly speaking, I have your cloak because I had to confiscate it, given the fact that you used it to break into my rooms." Snape informed him smugly. "Besides, it would be irresponsible to let you wander the castle alone in that weakened state. And I should keep an eye on what might become mine."
Harry protested half-heartedly, but enjoyed far too much the way Snape had his arm around him as they walked through the dark castle together.
He liked this side of the Slytherin and he would make sure to see a lot more of it.
The End
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(or maybe that is a lie, because I am thinking about writing another chapter of this one day 🤭 )