The Black Book - AU - Locked to seaweed_writes

[ihadabadday]

He was lucky with his expertise he was able to find a job relatively quickly in a field he was familiar with. John looked down at his mobile as the alert came through. Christ. It was going to take him at least twenty minutes, if he was lucky, to get to the scene. But, he packed his things into the case and headed out.

He had been in Afghanistan for five years. First as a medic, then a doctor, and finally a hunter. He still was a doctor, but he had been assigned to an elite unit in the desert. Part of him felt a bit odd about all of it. But he didn't quite mind.

He made sure he had everything before he left.

He heard the annoyed voices, before he saw anyone as he entered the room.

"Oi. Who're you?" A man with two days of stubble and mussed black hair asked.

John paused and looked him over before his eyes landed on the gentleman in the suit with salt and pepper hair. There he was. "DI Lestrade? I'm Doctor John Watson, the new Occult Specialist, I just started last month." He gave him a smile, wanting to be nice, but not too friendly. People got jumpy around the occult. He saw it all the time in Afghanistan, and even here in London.

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[seaweed_writes]

"Mmmmm.." The vibrations of his voice could be felt against John's skin.

And still he drank.

He knew how much he could drink from a human, but he didn't know about a half demon, so he had to be careful.

God, he wanted John to fuck him with that gigantic cock of his, but he couldn't stop this now. He had to keep drinking. He had to continue.

He started to rut against John, fucking at his lap while he continued to suckle at John, drinking more and more of his blood.

[ihadabadday]

John's hands dropped away from Sherlock's hair, groaning. His world was darkening a bit. But it felt so good.

"Sherlock..." he groaned.

His wings moved and surrounded Sherlock, keeping him close.

[seaweed_writes]

"Nnnnggggg..." The feeling of those wings surrounding him, it was.. intoxicating.

As much as Sherlock wanted to keep drinking, he could see that John was starting to fade. It was almost time to stop.

"John..." John was goring weak, and yet he could still feel that huge cock pressing against his painfully straining trousers.

He kept drinking for a few moments more, until John started to sway and have a hard time sitting up. And only then, finally, did Sherlock move his mouth away, licking at John's wound and cleaning the last of the blood that was trickling out.

"John... It's time.." He had to do it now, while the blood was still fresh and draining from his own neck if they wanted to blood bond. Sherlock rocked against John, desperate to come, but just simply rubbing inside his trousers wasn't enough.

[ihadabadday]

He looked at Sherlock and nodded. He could. He wanted to. "Sh... Sherlock..." John stammered. Everything was a bit fuzzy, but he wasn't going to pass out. No... There was so much to do. Sex to be had.

He licked his lips, focusing on the vampire in his lap.

It had been sudden, all of this. But it was okay. It felt right. All of it.

[seaweed_writes]

"John... You have to bite me. NOW." The saliva in Sherlock's mouth has anti coagulant properties, it could help to keep the two tiny wounds open, but only for a sort time. If John didn't bite him before they stopped bleeding, then he would Change. Humans would change into vampires, but he had no idea what would happen to John.

Sherlock leaned his head over, exposing his neck, even pointing out where John should bit. "Hurry. Bite me now, before it's too late. I need you to bite me."

[ihadabadday]

John nodded and leaned in. He kissed right over the pulse point and then bit down, his own fangs piercing the skin.

He shivered and then took a drink. This wasn't the first time he had blood. But never had it this way. It was such a different experience.

He kept his wings around Sherlock as he drank.

[seaweed_writes]

"Ahhhhh!!" His whole body went rigid, his eyes went wide, his pupils blew wide. Other than the vampire who had turned him 400 years ago, against his will, no vampire or demon or anything else had every drank his blood. He had no idea what it would feel like.

It was the most intense feeling that he had ever had. It felt like his whole body was being shocked by an electric current, but not in a bad way- in the best way.

There had been one little pinprick of pain, and then, everything was pleasure. He gasped and rocked down hard against John, his cock was rock hard and dripping inside his trousers. He felt safe in JOhn's wings, and he leaned in as close as he could, trying to touch every part of John that he could.

[ihadabadday]

John pulled back and pressed a kiss to the spot he bit. "Sherlock..." he whispered. He was so hard and so... So...

"I need you. Please. I need you." He begged, "I want you."

John tugged at Sherlock's trousers, wanting them off. He didn't want to hurt Sherlock with his claws.

[seaweed_writes]

"Fuck...." Sherlock groaned. He wanted his trousers off as well. But John hadn't drunk enough yet, and he still needed to drink his fill before his neck stopped bleeding, and it was already slowing.

So Sherlock got up just enough to practically rip his trousers and pants off at the same time. They did actually rip a little, but he didn't care. Immediately, he sat back on Johns; lap, his much smaller erection pressing against John's much larger one.

"Please... John... drink me.. fuck me... take me... please.."

[ihadabadday]

John pressed his face back to Sherlock's neck and started to drink again. He wanted this. All of this...

Letting just his hands and fingers become human, he slid them to Sherlock's arse and ran them over his hole.

He didn't say anything as he pushed a finger in, still drinking. He would until Sherlock told him to stop.

[seaweed_writes]

Since he was a vampire, he mad a much higher threshold for pain than a normal human would. Even with that, he knew that in order to take that cock, he would need at least some stretching. It was thicker than his fist and almost as long as his forearm. He had a feeling that in human form, it was more aligned with a human size, but right now, he didn't care to find out. He just wanted it inside of him.

"Jj-john... stop... teasing." Sherlock tried to bear down, but John didn't let Sherlock force the now strangely human shaped and sized finger inside of him yet. He could already feel the tingle of the magic. the binding that had started between them. It still needed more time, and John still needed more blood. But it wouldn't be stopped now that it had begun.

"I need you to spear me with your giant cock.. I want to feel you rip me open. .."

[ihadabadday]

John groaned and continued to drink. He could feel the magic moving between them and it made his head spin and spin. He was so hard and so desperate.

How was the vampire in his lap such a slut? A size queen?

He added two more fingers into Sherlock, making it three inside him. He wanted... He needed...

[seaweed_writes]

Sherlock shut his eyes tight. He knew he couldn't have too much more blood drained from him.. It was almost complete. He was starting to feel lightheaded, the room was spinning, and his stomach was reeling.

And yet, the pleasure was even more intense. He hissed in a brief moment of pain when the second, and then the third fingers went inside him. It wasn't even half as thick as John was. He didn't care. He wanted to be fucked until he couldn't walk, fucked so hard that he would never forget how it felt to be pulled open by something that large.

"More.. I need more.. more.." His voice was a bit slurred, he was almost at the limit of what could be drunk from him, and yet, he wanted to skirt that dangerous knife's edge.

[ihadabadday]

John pulled his fingers out and put his hands on Sherlock's hips. He needed to lift up.

The blonde finally pulled off his neck and gasped. "Sherlock..." he gasped. He did indeed lift Sherlock and position him over his large cock.

"Do you like my cock?" He managed.

[seaweed_writes]

Sherlock groaned when the fingers were removed. He was stretched and open, but empty. The sound he made was almost a whimper. He was not particularly heavy, so he wasn't surprised that the half demon had no problem at all lifting him up bodily off of his lap.

His vision was starting to fade, he was right at the precipice of too much blood. He needed John to stop, and he tried to tell him, but his voice was jumbled and indecipherable. He needed John to stop and he needed John to fuck him at the same time. And yet, he coldn't tell him either, all he could do was to try to nod his head, but he wasn't even sure if his body was responding to what he was telling it to do.

[ihadabadday]

John pulled back and kissed the the spot he drank from. Without another word, he pulled him down, gasping as that tightness surrounded him.

"Sherlock..." he gasped. Oh. He began to rock up into the vampire.

"You're so tight. I'm going to fuck you, make you ride my cock..."

He nuzzled Sherlock's head, kissing the side of his head. "I've had a cock twice the size of my own cock inside my body, stretching me. Fucking me..."

[seaweed_writes]

He was still lightheaded, even though John had stopped drinking from him- and just in time really- it was going to be a while before his body replaced the blood that was removed. And until then, he would be woozy and weak.

"AAAHH-Ahhhhhh!!" John didn't hesitate, he pushed his huge, thick cock all the way inside of, no pausing to get used to the feeling, no slowing down until his large, full balls slapped against Sherlock's perineum.

Between the pain, and the lack of blood, Sherlock almost blacked out. His eyes fluttered closed for just a heartbeat, and then consciousness fully found him again. He was stretched well beyond his limits, wider than anything he had never had inside of him before, by twice the length and the thickness, at least.

There was nothing Sherlock could do but wrap his long, thin arms around John's neck and hold on for dear life. There was no way that Sherlock could control himself enough to try to fuck John's lap. He was at the man's mercy.

So.... he was a size queen too? Sherlock vaguely thought to himself, having a hard time about thinking of anything besides being slowly fucked by the giant cock. Sadly, his cock, while well endowed by human standards- long but thin, with a little bend upwards- it was nowhere near what John hard. He was disappointed that he couldn't see John being fucked by something larger than himself.

[ihadabadday]

John groaned. "Fuck you're tight. Such a tight slut. Begging for my cock." He groaned.

It had been some time since he had been with someone this tight. But most of his sexual conquests lately had been while he was in his human form.

But this. Being with Sherlock. Laying claim. His.

"I know plenty of demons who will fuck anyone. Shove their head down and fuck them until they pass out, a giant cock in their arse or cunt or mouth. Or every hole they have."

[seaweed_writes]

"Yessss.. morrrrre..." He didn't care that he was begging like a slut. He wanted this.. He NEEDED this, to be fucked and filled by John. He wondered how much come was inside those balls. They were much bigger than human bollocks as well- so did they hold more?

He knew that he would have his answer sooner than later.

Sherlock also wondered, were true demons even bigger than John? He found himself wanting to know, but he couldn't ask, his voice was not working. He also needed to stroke himself, he was hard as a rock and dripping copious amounts of precome, but John hadn't said that he could.

"P-p-please... let..." Was all he could get out. He put his hand close to his cock, but didn't touch it. He had no idea what incurring an half demon's wrath would entail, even vampires knew not to piss off full demons.

[ihadabadday]

John continued to thrust up. Give him what he wanted. What they both wanted. To affirm this new bond. To know each other in every way. To mate.

He groaned and pressed his face against the side of Sherlock's neck that he hadn't drunk from. To not lose control.

"Touch yourself. Let yourself go..."

He was spiralling down and down. So close to his own climax. He wanted to tell Sherlock that demons could shift their bodies into whatever form they wanted, to please their partners or trap new ones. Not that he did that of course. But he wanted to please Sherlock.

[seaweed_writes]

He couldn't even find the words to thank John for letting him do this.. he was afraid he might spontaneously combust if someone, either himself or John, didn't touch his cock right fucking now.

Instead, Sherlock groaned and took himself in hand. Just the act of doing that almost made him come, he was so on the edge and close to climaxing.

He timed his movements with the thrusts of the half demon under in. It only took three strokes before his whole body went rigid, his eyes and mouth opened as wide as they could, and his body shook. His bollocks were drawn up to his body, and his cock pulsed.

"AHHHHHH!!!" He cried out towards the heavens, his head thrown back. In his 400 years, he had never had an orgasm as intense. He saw spots in his vision, an he was pretty sure that he actually blacked out for a short time, but his come spurted in several long, hard pulses that were strong enough to actually hit John in the face, as they were facing each other and he was in John's lap.

His whole body sang and swayed and his vision was blurry and he wasn't sure he was going to survive this orgasm.

[ihadabadday]

Oh was he beautiful. John licked his lips. Next time he wanted to swallow that cock down, lick him clean. Yes. He wanted to submit to Sherlock Holmes. Be his toy. Something he never thought that he would want.

John held him tight as he slammed up into the vampire. Once, twice and then he was coming into him.

There was so much. He could cover Sherlock's torso with it. Or get a female pregnant with it. He even heard stories about demons getting any gender half demons pregnant.

He slumped under Sherlock, gasping.

[seaweed_writes]

"Nnnnnff...." Sherlock was adrift in a sea of dopamine and hormones and post coital bliss. He grunted softy- his brain knew what was going on, he could feel it and see it and hell, even smell it- thought it felt like he was floating a bit a way from his body. But there was nothing he could do but just let John keep fucking him until he was done, until those giant balls were empty.

It seemed to take forever, there was so much come, it was leaking out of him back onto his own arse and thighs, John's legs and thighs, and literally soaking the bed under them. He figured that there would be a lot, but it was more than he had ever imagined, more than could even remotely possibly fit inside of him.

And then, finally, it was over. John was still hard and still twitching softly inside of him, still dribbling the last few drops of come while he slumped down, desperately gasping for breath, just like Sherlock was still doing.

[ihadabadday]

John carefully extracted himself from Sherlock and laid the vampire down on the part of the bed they had just fucked over. He went to get a flannel to clean Sherlock up. He began to wipe away the cum, groaning at the sight of it spilling out of the vampire.

Once they were both clean, he tugged Sherlock to the clean part of the bed and made himself the big spoon, pulling him close. It was comfortable. Happy. He closed his eyes.

[seaweed_writes]

Sherlock was pliant while John pulled out of him, thought he made soft noise at the amount of come that came pouring out once his thick cock was no longer like a finger in the dike. He was quiet and pliant and still while John cleaned him- his arse was still leaking a bit of come, even after he had been wiped down. And he was still and pliant and happy when John, even though he was smaller, made himself the big spoon and wrapped his arms around the vampire, holding him tight against his body.

He made a soft grunting noise, it was all he could do, as a warning. His eyes felt like lead and his body doubly so. He wanted to fight off sleep, he really did, but it was nothing doing, and he was deep in a dreamless sleep in less than five minutes.