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Harry entered the attic in Grimmauld Place and scrunched his nose at the mess. There were empty firewhiskey bottles, dirty clothes, and track all around the room, and Buckbeak, who he had come to see, had a makeshift stall made of wood trunks and dirty blankets. He was disappointed in Sirius' lack of care of Buckbeak, but Sirius seemed unable to take care of himself at the moment so Harry decided to do something for both man and beast.
The first thing he did was bow to Buckbeak who was laying down, then he waited until the hippogriff bowed its head before he began to gather up bottles to stack by the attic's trap door. "It must be pretty awful to be stuck in here," he said to fill in the silence. "How did Sirius get you up here anyway? I can't see you climbing up a ladder to squeeze in. I guess it's some sort of magic, isn't it."
Harry paused to look at the window to see if it was big enough for a hippogriff, but it wasn't. He heard the beast shifting around so he glanced behind him and saw that Buckbeak was beginning to groom himself. "Hm, I should probably bring a brush and a bucket of warm water and a towel to clean you up," he said as he eyed the normally proud animal. "I bet you miss the forest. Malfoy is such a git."
Harry resumed his task, but this time it was in silence so he could get things done quicker. He went to the window to open it for some fresh air to clear out the stale smell of alcohol, sweat, and animal, then he started picking up the dirty and crusty clothes. "Awe, sick," he said with disgust when he picked up a shirt that was as messy as the rest. "Sirius jerked off in these! This is so ew! Poor Buckbeak, you've had to live with this the whole time. I mean, it's a step above cleaning Dudley's room with his socks in one way, but the sheer amount is..."
Harry made a face and dropped the clothes into a pile so he didn't have to touch them anymore then collected the rest by kicking them into the pile as well. "I'll be right back, Buckbeak. I'm going to get rid of the bottles first and find some new bedding as well as something to use as a laundry bin."
Harry glanced at the creature to make sure he was ok, smiled at how Buckbeak was grooming his belly, then kicked the trapdoor to open it and make the stairs leading down form. It took him several trips up and down the ladder to get the bottles out and he was sweating by the time it was done. He still had to collect clean blankets for Sirius and Buckbeak's beds, so he went in search for a large crate. The bottles were put in there, dumped into the bin in the kitchen where Sirius had passed out on the table at, then he collected blankets and sheets from various cupboards and rooms to put in the crate on the way back up. He barely made it back up and was glad for the open window since he was feeling hot after all that work.
"Oh, hi Buckbeak," he said when he realized the hippogriff was up to inspect the room. "Yeah, I know, the clothes are gross. Give me a minute - I need to close the window before it gets too cold in here."
Harry set the crate down by the trap door, pulled it shut so Buckbeak couldn't hurt himself if he went that way, then went to close the window. He turned to go back to the crate so he could dump the clean blankets and sheets out next to the bed, gathered up Sirius' bedding to put into the crate, then he pulled off his Weasley sweater and tossed it to the side since he was still sweating too much. "Let me get those clothes, Buckbeak," Harry told the hippogriff as he approached. "You don't want to keep sniffing at them. It's gross."
Harry bent over to look for spots that were not crusty so he could pick them up without getting himself icky, but Buckbeak reared up and screeched so Harry froze in that position. He hadn't known he had to bow a second time, so he made eye contact and didn't blink even though he had to twist his head around a bit for it since Buckbeak had moved to flank him.
Harry was praying that the beast would calm down and be appeased, but Buckbeak spread his wings when Harry made eye contact and Harry braced himself to be clawed when Buckbeak's giant left talon came down on him. Rather than clawed, Buckbeak was smothering him in Sirius' rank clothes, and he could feel the back of his pants getting pulled by the giant beak.
Now would have been a good time to panic, but even if he screamed there was nobody home that could help. Sirius was probably not going to wake for hours, Kreacher would gleefully watch Harry get eaten by a hippogriff, and the Weasleys were not going to be coming home until the visiting hours were over. Rather than waist his energy and limited oxygen on flailing and screaming, Harry focused on trying to get enough clothes out of the way so he could breathe and talk Buckbeak down.
Harry had managed that herculean task and realized that Buckbeak was not eating him or ripping him to shreds. The hippogriff had him pinned down by his upper back and there was a sharp talon on each side of his neck, but besides some superficial scratches he was only being kept in place. Harry's pants were being torn, but the shark beak had not nicked his skin. Most of the pain was coming from his jeans being so yanked and pulled so hard that the durable waistline was digging into his belly and hips. He moved a hand to the button in the front and gasped with pain when the next yank felt like his lower belly was being crushed.
"Ow, you're hurting me, Buckbeak!" he exclaimed as he pulled the button open before the next yank. "What has gotten into you?!" He was having issues with the zip, but they were Dudley's pants so opening the button was enough for him to try to push them down instead. "Take the pants! I don't like them anyway. Oh shit."
Harry hurriedly kicked off his sneakers and barely managed it in time so his pants didn't get stuck in them. Buckbeak was probably angry about clothes because of all the dirty ones in the room, and that was why he was stripping Harry of his. Buckbeak practically lifted his legs into the air to tear the pants off, then Harry was trying to scramble up to get away as soon as his knees were back under him.
Except he couldn't. Buckbeak hand not released him. He froze when he felt the cool and hard beak rub against his butt cheek and continued up along his right hip then side.
"I'm not wearing any clothes now," Harry said while trying to keep irritation and fear out of his voice. It sucked that he couldn't insult the bird brain at the moment since he had many things he wanted to curse out. "Yes, yes, I like you too. Please let me up, Buckbeak."
Buckbeak's response was to nibble at his hair. Then Harry felt hot liquid begin to splash out on his legs, arse, and back and it took everything he had to bite his tongue so he didn't cuss out the bird for pissing on him. He sighed and went still while Buckbeak groomed his hair and marked Harry as part of his territory, and the saying of 'no good deed goes unpunished' came to mind. At least his sweater was safe... It was by the trap door so he would be able to grab it when he ran out as soon as Buckbeak let him go.
Harry thought it was over when the hippogriff stopped pissing, but he felt something slimy slap his right thigh then begin to squirm up. "What the fuck?" he couldn't help but yelp as he tried to twist to see what it was. Buckbeak shrieked in his ear and pinned him harder which made him freeze again. "Sorry, I'm not insulting you, just let me go and I'll leave?"
The hippogriff firmly gripped the back of Harry's neck in his beak, and Harry thought for sure that his life was going to end. The Weasleys would come back to see Sirius passed out in the kitchen and a dead and piss covered half eaten Harry in the attic and the only consolation he had was that he would be alive to deal with the fallout. But Buckbeak removed the clawed feet from his back and gave him a glimmer of hope only to have it crushed at the same time as the bird nearly crushed him under its chest.
Catching his breath was the last thing in his mind since he realized his ass was up since he had stayed prepared to scramble away at the first chance he got, the slimy thing wiggling around might be Buckbeak's cock, and the beast had marked Harry as his territory. "Fuck."
Harry immediately straightened out his legs to shake off the appendage and make it so he wasn't in a mounting position, only Buckbeak resumed grooming his hair as he laid all the way down on Harry. The Hippogriff was aware enough not to completely crush him, but it was a lot of weight and Harry couldn't wiggle away nor could he take a deep breath at all. His drop had put Buckbeak's cock on his lower back and he thought he was safe from it, except the hippogriff shifted enough to create some space and he realized that whatever it was, it was kind of prehensile since it was now squirming down.
On one hand, he could breathe better, but he wasn't going anywhere and it was definitely moving down to his ass. "Please don't, Buckbeak," he begged. There was no way to hide the panic and fear in his voice even if he wanted to, but he hoped it would free him. "I saved your life, remember? If you need a mate, I'll talk to Hagrid and see about getting a female brought in!" It still didn't stop and he whimpered since it was beginning to burrow into his crack like an earthworm did the ground. "I'm not even your species! Or a female!"
That didn't seem to do anything except get his head nuzzled, and Harry let out a terrified whine as he tried to wiggle out when Buckbeak's thing found his virgin hole. He didn't even know that it looked like, but he could tell it felt strange! The end was rubbery like cartilage and tapered no bigger than a finger, but he could feel the trailing area get thicker like a constrictor snake did. The end also felt like the only hard part while the rest felt soft and squishy like a tongue might, but the texture was also a little bit nubbly like there were bumps all over it or something. The world completely narrowed to his arse and that tip when it found and began to burrow into his hole, then it stopped and more liquid sprayed out.
It was far too viscous to be piss, so he hoped Buckbeak just came and was done. Animals usually didn't mate for longer than a few minutes, right? Harry had no idea that his terrified whines were really loud until he bit back a wail of fear when it resumed its journey that was made a lot easier for the beast.
Harry now wished he wasn't hyper aware of his arse, but he was and it was awful. It kept stopping to spit out more slick which meant it didn't hurt like he thought it would, but it was opening him up wider the deeper it pulsated in. Then that rubbery tip dug into a spot Harry had no idea existed, and his cries of terror changed into one of pleasure when he began coming all over the soiled clothes he was pinned on top of.
Buckbeak crooned in approval as he gave Harry's ear a nibble of affection with his dry tongue even coming out to play. Harry didn't notice that since what had been slow wiggling before was now much much faster so that by the time he was done coming he felt completely stuffed. It was a strange stuffed, too. It felt like Buckbeak was in as deep as possible and the rest of his penis had scrunched up inside like an accordion or something.
That, or Harry was imagining things.
He wasn't sure since he could only feel, and everything he was feeling was brand new. It was also great. Harry had never felt anything so good in his life before. He became more aware of his surroundings to find that he was shaking and panting like he had just run a marathon and Buckbeak seemed to be perfectly content to stay where he was since he was still grooming Harry's hair. Then he recalled he was in Sirius' room, was covered in piss, and was on top of piss and cum covered dirty clothes.
"Okay, you had your fun," he said to Buckbeak in a bartering type of tone. "Let me up before we are caught so I can clean the room and shower. We can pretend this never happened, okay?"
Buckbeak shifted a little, but he didn't get off and Harry realized that there was still more cock he could feel going down the back of his thighs to Buckbeak's haunches. It was intimidating and made him whimper, but his insides clenched up in want. Then he gasped because tip began to squirm once more, and he could tell it was twisting to go around that first bend.
Harry tried to see if he could squirm out, but he froze when there was a warning prickle of pain at his arse. It felt like he had velcro spikes threatening to bury itself in his tender rim, then Buckbeak shifted again to push a bit more inside him and he realized it was that nubbly texture he had taken note of earlier.
Buckbeak had spines like a cat, and it would hurt to pull away even if he could.
The hippogriff seemed aware that Harry couldn't escape anymore since his torso wasn't pinned down by the feathery chest. Actually, Buckbeak seemed aware that he now had control since he began to raise his haunches and that forced Harry to get his knees under him before his insides got scratched up. That in turn allowed the penis to slip in even deeper, and Harry squeaked when he tried to stop his moan which made him begin to blush out of embarrassment.
"S'alright," he slurred out loud to reassure himself. It wasn't like he knew this was going to happen! And he didn't ask for it! Plus it was better if it felt good rather than bad, right? "Yeah, s'all good." He paused to swallow the drool threatening to leak out. "Just don't take forever, Buckbeak. Can't get caught."
Buckbeak must have been waiting for a signal like that since the gentle squirming of the tip turned into a smooth glide in. Harry's mouth dropped open as he pushed his arse back to encourage all of it and Buckbeak didn't disappoint. The spines only went a couple inches deep and didn't seem to get deeper, and his stomach began to feel like something hot and slippery was stroking a core inside of him. Harry wondered if the spikey thing was just some kind of sheath or foreskin or something, then he decided that he was thinking too much and not enjoying enough.
It was probably going to be his only time with the hippogriff, after all.
Harry closed his eyes and imagined a slimy and hot tentacle inside of him. His rim was probably stretched open to the width of Neville's chubby cock, but the burn felt delicious with the prickle of the spines to offset it. There seemed to be more texture along the length, but they were softer and was what was allowing the hippogriff's shaft to continue to go deeper. When he felt the prickly press of the actual sheath in between Buckbeak's legs start to tickle his ass crack, he reached a hand down to grab his own prick and pushed back hard so it kissed his rim.
Harry wanked when Buckbeak went still, then he let out a lewd moan when he realized that there was still more coming. His rim was so stretched that it had turned into a burning itch, and tiny rocks back and forth had the spines relieving it in the most delicious way even if they were beginning to pierce in. He came just like that all over the clothes under him, and as soon as he stopped ejaculating his hands moved farther down so he could rub and massage his own balls to help spread out the pleasure before it became overbearing.
"Merlin, Buckbeak," Harry groaned. He slipped his hand even further back so he could touch and then rub the sheath pressed against his ass. "Yes, good boy, keep filling me up with your magnificent cock!"
His praises made Buckbeak coo out an approving sound. The hippogriff shifted, and a few things happened all at the same time. The spikes sank in all the way and it sent a pain signal similar to a nipple getting twisted or pinched just right. That made Harry feel like he was coming again, but rather than ejaculate, it felt like it was backfiring. Harry couldn't say if he did or did not like his first dry orgasm since he was completely overstimulated, but that added sensation sent his ass into orgasmic spasms that milked the coiling cock inside of him. The slime that Buckbeak had been releasing to push his way in began to start leaking out of his arse and all over his hand.
Then Buckbeak began to rut.
The pain from the first thrust tearing his skin didn't register as anything except for a higher endorphin rush, and it pushed Buckbeak's sheath inside. Every following thrust forced the sheath further in until the spines were covered which would have allowed Harry the chance to escape except he didn't want to. He was pushing his ass back to meet each thrusts while he wailed out gibberish that could be taken as 'good boy!' and 'harder!' if his tongue felt like working for a moment. His cries were the only reason the wet squelches of his ass being pounded wasn't the loudest thing in the room.
Harry tried to grab his cock to wank it with his slick covered hand, but it was completely flaccid and so sensitive that it made him flinch. He slid his hand further up and groaned because he could feel Buckbeak inside of him. It made him clench up tight, then Buckbeak clamped down on the back of Harry's neck and pushed his face into the filthy fabric under them. He didn't care about where his face was since his second orgasm was triggered when he felt Buckbeak dumping thick cream inside him.
It was like nothing he had ever felt before. His stomach was already feeling heavy from how much cock was inside of it, so it made the twisting flutters in his gut intensify. It was like butterflies in his stomach only much much more present, and since Buckbeak still fucking him through it, there was the slip and slide that tickled like diving down on his broom. Harry could feel more liquid gushing out of his ass because of how hard he was coming, and with the deadly beak on his neck, he had to take what the hippogriff was giving him while he clutched his stomach harder.
Harry felt absolutely filthy and he loved it. Buckbeak was flapping his wings for more force and was completely wrecking his ass, and all Harry wanted was the ability to urge the hippogriff on. Harry slipped his hand back down to his flaccid cock to give it a hard squeeze, then he had his head and shoulders take the weight so he could move his hands to his arse and spread his cheeks open so he could feel more hot liquid squirt out every time Buckbeak pulled back.
Harry moaned and drooled while he stayed in that perfect position. It was amazing and he hoped it would never end. Sadly, he felt the swollen cock inside him shrink and soften, then Buckbeak let go of his neck but pinned Harry back down under his belly. Harry didn't mind one bit, he was warm, felt full, and fell asleep to Buckbeak affectionately rubbing his beak against Harry's head while he used Harry like a cock warmer.
After an indeterminate amount of time, Harry woke up coming with Buckbeak rocking inside of him. He was surprised his arse didn't hurt since he knew there had to be some issues between the barbed end and the spikes that had dug in. Buckbeak's movements were rather gentle compared to earlier, then he realized why.
"James, y'shtarted th' party without me, slut," Sirius drunkenly slurred. Harry froze when he heard his Godfather's voice, then he didn't look back when he realized that Sirius was so drunk that he thought Harry was his father. "Knew you'd like hippogriff cock, you were a lovely bitch for Padfoot. Then y'had to go get married."
Harry had just heard far too much about his father and Sirius than he wanted to ever know. Further, his godfather was behind Buckbeak and pounding into the animal. Buckbeak wasn't fighting it at all - he seemed willing to let Sirius do most of the work and just squirmed his cock around inside of Harry in a way that made him loudly moan.
"Tha's right, bitch," Sirius half growled as he pounded harder into the hippogriff. "Beaky boy here's in a rut, an' I thought I'd have t'teach 'im who the bitch is between us like last year. He's perfectly happy to let me fuck the aggression out of him this year as long as his cock stays wet in your cunt. Won't let me play with your ass, though. Snapped at me when I tried to push 'em away so I could mount and knot you."
Harry could tell he was red with humiliation, but being talked to like he was good at being a fuck toy for beasts had him pushing his ass back for more. Sirius heard his needy little whines since he stopped talking so he could snap his hips hard enough to make Buckbeak do more than rock but not quite rut yet, then Sirius was loudly groaning out his own pleasure.
"F'ck James, I miss you so much," Sirius half slurred and half sobbed. "Love you, man. Going to sleep, don't leave before I get to knot you."
Then Sirius's steps were stumbling back and Harry heard him fall into bed with a loud snore. "Buckbeak, I need to go," he quietly moaned. He was still pushing his arse back and hadn't tried to move, and he really didn't mind that Buckbeak ignored him and began to rut again. "Nnnggg, one more time. I promise I'll sneak back later. Ask Sirius if I can take OWLs early and not have to go to school anymore. I'll even be his bitch if he lets me be yours."
It sounded like a good plan to Harry. Sirius would no longer be alone, Harry could see himself happy as long as Buckbeak used him at least once a day, and he wouldn't have to deal with Umbridge or anyone anymore...
Sadly, Harry hadn't been allowed to drop out that winter and Sirius had not mentioned anything about them or Buckbeak which Harry figured meant that he had been too drunk to remember it. When Sirius died at the end of the year, his dreams of being free now that he had taken his OWLs died along with his godfather. That summer, he learned that Sirius had left everything to him including Buckbeak.
Harry refused to go to school for sixth year and took over Sirius' spot of 'hermit in the attic' that was honestly the best thing to happen to him. Voldemort tried to kill him when Snape acted as traitor like Pettigrew had, but Buckbeak bit off the dark lord's head and killed him. Harry didn't even realize what happened until he saw the body after Buckbeak decided he was tired and needed a break from the sex. He celebrated his win with more sex, and when the body began to stink, he took his first shower in days to get rid of the layers of come all over him so he could drag the body to the ministry.
He got all kinds of money and awards for it, but the best part was that owls and howlers begging him to kill the Dark Lord no longer interrupted his time with Buckbeak.