Chapter Text
It was the day after the Yule Ball when it happened.
Harry felt a trickle of something leak from him, and stiffened. ‘Oh, no.’ He thought frantically. ‘Not now!’ He stood up, knocking the chessboard and causing several pieces to move, making them start yelling at him in their agitation.
“Mate? What’s wrong?” Ron asked, getting up as well.
“I have to go.” Harry said in a rush, trying to sprint past the redhead.
Ron grabbed his arm, stopping him. “What’s wrong, Harry? Go where?” He asked in bafflement.
Harry could feel the itchiness under his skin, increasing with every second. “I just… I have to go.” He repeated, then lowered his voice. “Before the Alphas smell me!” He hissed.
Ron’s eyes widened in recognition, and he released Harry, nodding. “Right. I guess I’ll… See you in a few days, then.” He said.
Hermione watched him with a frown as Harry dashed out through the portrait hole, thinking, ‘Severus, Severus, I have to get to Severus!’
Harry was several feet away from the portrait when he heard an older boy call out, “Stop!” in a commanding tone of voice.
Panic seized his heart as his body almost obeyed the voice, making him stumble. ‘Alpha.’ His brain supplied, immediately followed by, ‘Not my Alpha!’
He kept running, heading straight for the dungeons as fast as he could go. He heard the Alpha give chase, along with what sounded like two others. Harry was fast, and he headed for the stairs, taking them three and four at a time, somehow managing not to trip as he sped down them, running for his life, or more accurately, his virtue.
Thankfully, the stairs seemed to want him to escape, blessedly not moving while he ran, heading deeper and deeper into the bowels of the castle. He got to the door to Severus’ rooms and panted the password, slipping in and closing the door behind himself, throwing his back against it as he heard the Alphas reach it, unable to pass.
He bent double, chest heaving as fists pounded on the door and warning growls from the hall beyond reached his ears.
“Harry?” Severus asked, sitting behind the desk he kept in his rooms, a pile of essays in front of him and a bottle of red ink with a quill in it sitting at his right hand. “What’s the matter, and why are there—“ His eyes widened as Harry’s scent wafted past his nose, setting his pulse to pounding and his head swimming. He stood up. “Dear Merlin! Do you have any idea how dangerous this is?! We have to get you to the Hospital Wing—“
Harry shook his head. “Can’t.” He rasped. “Three quarantine rooms. Zabini, the twins…” He explained, shutting his eyes as his head swam, catching the scent of Severus from all angles, further inflaming his heat. “No room for more. I need… Severus, please!” He begged, opening his eyes and staring the man down.
Severus opened his mouth, hoping to gain a few moments’ reprieve by not actively smelling Harry’s intoxicating scent. It only made things worse. Not only was he smelling it, now he could taste it, sweet and thick on his tongue. “No.” He whispered. “How did you even make it here, with those Alphas chasing after you? The first thing they’d try would be ordering you to stop running—“
Harry shook his head. “Not my Alpha.” He told Severus, walking toward the man as he pulled off his robe. “I wanted my Alpha.” He finished, pressing himself against Severus and wrapping his arms around the man’s neck. “Please.” He whispered. “Please?”
Severus didn’t reply, closing his eyes and fisting his hands at his sides. The scent was calling to him, sweet and sinfully seductive. He wanted to give in to it, but… “Harry, we cannot. You’re out of your mind with heat, you don’t really want this, and I won’t force you into—“
Harry covered his mouth with a hand over it. “Then don’t bite me. Just fuck me. Knot me.” He whispered. “Please, Severus, I’m on fire!”
Severus gulped, pushing the hand away from his mouth. He fought to keep what hold he still had over his, admittedly, tenuous control. “I really shouldn’t take advantage—“
Harry tilted his head, whining low in his throat, looking at Severus pleadingly with eyes that were thin streaks of emerald around lust-blown pupils. “Alpha, please!” He breathed.
Severus’ control snapped as those two words coupled with Harry’s overwhelmingly sweet scent flipped a primal switch in his brain, and he leaned forward, taking Harry’s mouth in a frenzied kiss, hungrily mapping out every crevice of the warm cavern, committing every last sensation and taste to memory.
Black would certainly kill him for this, but he was, after all, only a man, and Severus had never once in his life claimed to be a saint. Really, he was being pushed past the endurance of any man, with Harry in front of him, begging to be taken, giving off the most enticing aroma of fresh, virginal Omega in heat.
Severus pulled back and gasped, “Bedroom.”
Harry’s eyes lit up and he beamed at Severus, turning and heading for the room, stripping off his clothes as he went.
Severus followed, hastily undoing the buttons of his shirt and letting the garment fall to the floor. He kicked off his shoes as he passed the threshold to his bedroom, stripping the socks from his feet before he climbed atop the bed.
Harry had already spread himself out across the large bed, gloriously naked and achingly aroused, his small cock erect and his arse dripping with slick.
Severus tore at the buttons of his trousers, then slid them and his boxers off, dropping them beside the bed to deal with later.
Harry’s eyes fastened on Severus’ cock, and he licked his lips. “Alpha.” He whispered.
“I’m here.” Severus told him, coming to hover above Harry, holding himself up on his arms and looking down at the teen. “One last chance to back out. Say ‘no’ now, and I will leave you in here alone. You are under no obligation to be with me if you don’t want to.” He said, voice tremulous with barely-restrained need. If Harry told him to stop, he would, though it would, at this point, be physically painful to do so.
Harry shook his head and his arms came up to wind themselves around Severus’ neck. “Want you.” He whispered, pulling the man in close. “Only you. Always you. Severus, Alpha, please fuck me. Please knot me.” He burned, and the only places spared the agonizing fire of his heat were the places that were touching Severus.
Severus groaned and lowered his head to taste those sweet lips again. He suckled on Harry’s tongue, nipped at his lips, and traced every last tooth in his mouth before raising his head and trailing his lips over the jaw, moving down to the neck.
Harry tilted his head, allowing Severus to kiss wherever he wanted to. He’d gladly bare his neck to the man for a mating bite if he asked, Harry knew. This was the Alpha he’d chosen, and no other could ever compare. He whined low in his throat, and heard an answering growl from Severus as the man scraped his teeth over Harry’s throat. Harry could feel the elongated canines that presented while an Alpha was in Rut, and he shivered. If Severus was really in Rut, maybe he’d be getting a mating bite today after all. Alphas in Rut were generally ruled by instinct, and every instinct would be screaming at him to fuck, to bite, and to claim. Especially as Harry was a virgin. Most Alphas claimed any virgin Omegas they were lucky enough to find themselves lying with.
Severus licked over Harry’s neck, then slid one hand down to wrap around his small cock, stroking it. “So small.” He whispered.
Harry flushed and dropped his eyes, seemingly ashamed of his size, and Severus raised his hand to tilt the teen’s chin up, making him meet his eyes.
“Beautiful, my Harry. So beautiful. Every part of you is perfect.” He assured the teen, leaning in for another kiss.
Harry gasped into the kiss as Severus grasped his cock again, teasing it with feather-light touches.
“Do you want me?” He asked, letting his fingers slide lower, tracing around Harry’s slick hole. “Want me to knot you, my Harry?” He asked, bringing the fingers up to his mouth to lick the slick off of them, delighting in the taste of Harry, his own virginal Omega.
Harry nodded. “Yes, Alpha! Knot me!”
Severus’ eyes flared. “Then use my name, Harry.” He ordered, and Harry felt the Alpha voice wash through him, forcing his compliance, not that he would have withheld it, in any case.
“Severus.” Harry breathed, then licked his lips. “Knot me, Severus.” He begged, arching against the man’s body.
Severus smiled in satisfaction. “Good boy.” He praised, carding a hand through Harry’s hair. “My good, good boy.”
Harry leaned into the touch, soaking up the approval of his chosen Alpha eagerly.
Severus leaned in and kissed the side of Harry’s neck, inhaling the sweet scent. He trailed his lips down the teen’s body, finally reaching his cock, which he took into his mouth, making Harry cry out as his hands wound themselves into Severus’ hair. Severus licked the tip of Harry’s cock one final time, then moved lower, licking up the slick that had been leaking out of Harry. It tasted like honey and innocence, and Severus eagerly collected all that he could find, knowing that once he’d had Harry, the flavor would change, forever losing the taste of his virginity.
Severus was going to satisfy his craving for the taste before he moved on.
Harry moaned and arched underneath him, spreading his legs as far as he could and canting his hips to give Severus better access.
Severus pulled back and lightly smacked his thigh. “Turn over for me.” He ordered.
Harry whimpered and complied, burying his face in the pillows as Severus spread his legs again and buried his face between his pert globes, licking up his slick eagerly. Harry was producing a surprising amount, but then again, Severus had never had an Omega in heat before, so he had no idea how much was normal. He hummed as he licked and sucked at the teen, growling at the heady taste, causing another wave of slick to spill from the teen.
Harry whined and rutted against the mattress, trying to bring himself off with that friction coupled with the feeling of Severus devouring his hole.
“Oh, no, you don’t.” Severus growled, noticing what Harry was doing. “Up, on all fours. Present for me.” He commanded.
Harry raised himself onto hands and knees, then lowered his shoulders to the bed, presenting his arse and pushing it back toward Severus. “Please!” He gasped out, whimpering as Severus dove back in.
“I’ll have you when I’m good and ready.” Severus assured him.
Harry buried his face in the pillows and whimpered, feeling Severus’ tongue delving deeply into him.
Severus tongue-fucked him for a few more minutes, then pulled away, and took a moment to enjoy the view of Harry’s arse, soaked with his saliva and Harry’s slick as it continued to leak from the Omega. He ran a finger over the wet hole, pressing in just the tiniest bit.
Harry keened and pressed back, and the finger slipped into him a bit.
Severus smirked at the show of how greedy Harry was for him. “Are you ready, Harry? Ready for your first time?”
Harry nodded, panting harshly. “Please!” He begged.
Severus drove his finger fully into Harry’s arse, and the boy arched his back pleasingly. He pumped it a few times, then added a second.
Harry moaned at the intrusion of the second finger, pressing his face into Severus’ pillows to present even better.
Severus opened him as much as he could with two fingers, then added a third. He spread them, working the boy open with as much patience as he could muster. He was aching to just bury himself and begin fucking the boy, but he didn’t want to cause him any damage, or pain that he could easily avoid.
“Severus, Alpha, please! It hurts! I need you!” Harry cried out, nearly sobbing.
Severus cursed and removed his fingers, spreading the slick on them over his cock. There was no more time. If Harry was in pain, he needed either a knot or a potion, and he needed it now.
Severus drove in, burying himself in the tight channel.
Harry howled, arching back sharply. Severus could only hope the noise was one of pleasure.
“Are you okay?” Severus panted.
Harry moaned softly. “I…” He took a few deep breaths, then nodded. “Yeah. It’s just intense.”
Severus pressed a kiss to Harry’s neck right where it met his shoulder, as much of a claim as he’d allow himself to make right now, and began thrusting into him.
Harry moaned again, and pressed back to meet Severus’ thrusts.
“Are you going to be good for me?” Severus asked, his voice low and rough. “Come on my knot, untouched, like a good Omega? I bet you will.”
Harry nodded, panting too hard to speak, feeling each thrust of Severus’ cock brush against his prostate.
Severus could feel his knot forming, and knew that he was going to come very soon. Luckily, Harry wouldn’t be able to become pregnant without a mating bond, and Severus was not mindless enough yet to mate the boy, though since he was in Rut, it was only a matter of time before he did.
Harry climaxed with a loud cry of pleasure, and Severus gave him three more thrusts before his knot swelled fully, locking them together as he flooded the Omega with his seed.
Severus growled possessively as he curled around Harry’s body, guiding the teen to lie on his side in the bed while Severus was tied to him.
Neither of them were moving for at least twenty minutes.
“Mm.” Harry hummed and wiggled a bit, causing Severus to gasp as another orgasm was pulled out of his cock.
“Can you not be still? You are a bloody menace!” The dour man snapped without any real heat, smacking one hand against Harry’s bare thigh.
Harry chuckled. “So, once we’re free of each other, what are we going to do? Is there some kind of heat etiquette I need to be told about, or what?” He asked.
Severus sighed in disgust. “Well, firstly, I’ll have to inform Albus of what’s happened—“
“Oh, please don’t! What if he tells Sirius?! He’ll kill me!” Harry said in horror.
Severus looked at the back of the teen’s head sharply. “Literally, or figuratively?” He checked.
Harry sighed. “He’ll yell. A lot. And I’ll wish I was dead.” He answered.
“But he doesn’t hurt you?” Severus checked.
“No, nothing like that. He’s a good man, just loud. And kind of naïve, as far as his understanding of how the world is for Omegas and creatures.” Harry said quietly. “But he’s going to be so angry with me when he finds out what I did.”
Severus sighed. “Why me? Why did you pick me, of all the Alphas here?” He asked.
Harry snorted. “You mean instead of the stupid knotheads in Gryffindor? None of them were suitable. With the exception of Lee Jordan, but he’s kind of spoken for, he’ll end up with Fred or George, everyone knows that. You said if you had an Omega, you’d treat them kindly, like a person deserves to be treated. You were the only person I could trust, besides Neville, and he’s already found his mates.”
“Well, I can ask Albus to keep it a secret, but it is his decision in the end, and it’s not like I can keep it from him. He needs to know where you are. If he sends a letter to your home, it will be after your heat and after he speaks about it with you, so you will know. After I tell Albus what is going on so he can make arrangements, I will take a contraceptive potion, since I have one on hand for Alphas—I keep it just in case, thankfully—and we will come back to bed. I won’t lie, I am in Rut and will very likely mark you at some point; it’s probably best to get that over with while I am still in control enough to mark you somewhere that your Godfather is not likely to look. I’m sure that was your plan all along, so that shouldn’t be a problem with you.” Severus told Harry.
The knot finally went down and Severus’ cock slipped free.
“I’ll be back in a few minutes.” The man said, kissing Harry’s shoulder before getting up.
Harry rolled over and watched him, taking in the view of Severus’ long, lean body. He wasn’t a very hairy man, which made Harry happy. And he had a nice arse, Harry noticed, biting his lip as he looked it over. It was nicely rounded, and looked firmly muscled. Harry groaned as he laid back with a smile. He’d picked a good one, it seemed. Not only was he a decent man, but he was hiding a surprisingly sexy body.
And his cock and knot were apparently the perfect size for Harry, judging by how the man had filled him up while they were joined.
Ten minutes later, Severus came back with a dark blue potion which he raised in a toast to Harry before downing it in one gulp. “Now.” He set the potion vial down on the bedside table. “Where shall I mark you?” He asked, running a hand over Harry’s arm. “How about I bite you in a place no one but me should be looking, hm? Present, my Harry.” He purred.
Harry whimpered and followed the ingrained Omega response to that word, rolling onto his front, drawing his knees up under his body, canting his hips up and presenting his arse for Severus’ pleasure.
Severus growled possessively, palming each cheek and caressing the flesh while he considered exactly where he wanted his mark. He smirked and leaned down, biting into the fleshy part at the bottom of Harry’s left cheek.
Harry moaned and felt the bond spring into being. Severus was amused, smug that he’d been Harry’s choice after all, and eager to get back to the sex.
“Now that we have the rest of your heat ahead of us without worrying about that, let’s get back to what we were doing.” Severus purred, pulling Harry close.
“Mm, yes, Alpha.” Harry eagerly agreed.