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]

Where was John? He figured that he would have been out by now. He looked down, to make sure that William was asleep. He was. So he got up and headed back to the loo, only to hear a soft moan coming from behind the opaque curtain.

Was he...?

There was another moan. He was.

Quickly and silently, Sherlock undressed, then stepped into the shower behind John. He leaned down and nibbled at his neck. "Were you playing without me?" He said, partially teasing, but partially a little disappointed that John was getting off without him.

[ihadabadday]

He gasped and jumped a little when he felt the nibble on his throat. Oh... John turned to look at him. He let out a breath and shifted from human to demon.

"There you are..." he purred. He had hoped Sherlock would come looking for him. He needed his mate. He was ready. He needed...

[seaweed_writes]

"Fuck..." Sherlock had to step back because John in his demon form took up more space.. Well, that giant cock of his did.

"Oh, John." He groaned and leaned in, giving that huge, half hard cock of his a stroke. He had to use both hands to to it, using the streaming water as lube, so his hands slid easily up and down that length.

[ihadabadday]

He shivered at the touch, nailed fingers digging into the porcelain. "Sherlock... I want you. I want you to fuck me. Please."

John ran his tail along Sherlock's leg, teasing him. He ached for it. To be with his mate. To be wrapped up in him. He groaned softly and spread his legs a bit.

[seaweed_writes]

"Nnnng... " Every single time John turned into a Demon, he wanted John to bend him over and fuck him. It was almost like a Pavlovian response.

If John wanted him to fuck him though, of course he would. Sherlock turned John back around, moving his hands until his hands were flat against the tile wall.

"Fuck, John. I fucking want to take you apart when you are open and needy for me." He started to stroke himself, Just looking at John was getting him hard, and it only took a couple of moments to stroke himself to full hardness. When he was hard, he teased John by rubbing his cock against his arse cheeks.

"Maybe I should make you beg for me.." He growled, almost pushing in, but not quite.

[ihadabadday]

John loved it when Sherlock manhandled him. It only served to make him harder. Make him beg. He shivered and groaned, eyes closing. Fuck.

"Please... Sherlock. Please. Fuck me. Pry my tight hole open and pour your seed into it. Please please..."

[seaweed_writes]

"Oh.. you want me to touch you..." He paused for a moment. "Here?" He asked, pushing one finger in. He'd put a little shampoo on it, to help it slide in. With John's size, there was very little resistance. He was used to much larger things than Sherlock's index finger inside his arse.

"Is that what you want, you slut, harlot. You need my finger inside of you?"

[ihadabadday]

John keened at the sensation of that finger sliding in. Ohfuckyes. The porcelain didn't allow for much in the way of something to hold onto. He swore and pushed his hips back, raising his tail, so Sherlock could have all the access he needed.

"Yes! Please. Your fingers, your cock. Anything you want. You can put anything you want inside me." He gasped, "I'll be good and fuck whatever you want me to. Beasts, other demons, humans. I'll get on my knees for them..."

[seaweed_writes]

"Such a needy little whore. I want you to hold that giant cock of yours. I don't want you to come. I want you to come inside of me once I'm done using you. And maybe, if you are good, I can find some Vampires to drink from you while they fuck you. They aren't a big as demons, but they can bugger you nice and hard. "

Sherlock moved his finger in and out, then added a second finger and curved it to find his prostate. John really didn't need to stretch John out, but it felt so good to finger him and listen to him keen.

[ihadabadday]

John sobbed and nodded. "Yes Daddy." He gasped, "I'll be good for you..." he moved his hand and wrapped his fingers around the base of his cock. He would be so good for Daddy. He had to be. If he wanted to be stretched out and forced to take cock after cock.
.

"Please... Fuck me like the whore I am. You know I'll do anything for a cock. Anything..."

[seaweed_writes]

"You are a good little whore." Sherlock said, as he added a third finger. "Maybe I shouldn't even give you my cock. Maybe I should just fist you instead. You stretch so far, cause you like taking beasts and giant Demons in your arse, don't you, my good little boy." He rubbed against John's prostate again with all three fingers.

"And after I fist you and if you are a good boy and don't come, then maybe I can fuck you when you are stretched so wide open that I just slide in and out with no resistance. "

[ihadabadday]

He pressed his face against the cool tile, shuddering. "Anything you want Daddy. I'll take whatever you put in my slut hole. Anything. Please. Give me whatever you deem appropriate." John tried to lift his arse higher, wanting more.

He wanted to fall into whatever Sherlock was doing to him. Give in and let the vampire pull all that pleasure from him. Over and over.

[seaweed_writes]

"Shhhh... Little one. Daddy knows best." He crooned. "Let me make you feel good." Sherlock pushed the three fingers as deep as he could, fucking his boy with his fingers. He rocked those fingers in and out a few times, then added a 4th finger. There was some stretch now, but with a liberal amount of shampoo, the fingers slid in and out pretty easily. He scissored his fingers apart, to open John more.

"Are you ready, little one?" Sherlock asked."You are being such a good boy. Look at you, taking my fingers like a champ, sucking them up eagerly inside of you."

[ihadabadday]

He shuddered and relaxed, letting Daddy use him. Use his body. He gave a small whisper when three fingers became four. He swallowed and pushed back, trying to get more inside himself. He shivered.

"Yes Daddy..." he gasped, "yes..."

[seaweed_writes]

"The little slut wants more, doesn't he?" Sherlock asked. "Such a needy little whore. Well, Daddy can give it t you." He pulled out his four fingers and made sure that his whole hand was coated very well with the shampoo, and then slowly, slowly started to press his fist in.

There was a good bit of resistance with something that large, so Sherlock slowly rocked back and forth, pressing in a bit more each time, until finally he was able to push his whole fist inside of John. He didn't want to push in far, so he started to slowly fuck John with his fist, moving in just enough to brush against his prostate.

[ihadabadday]

John whimpered when Daddy pulled his hand out. He didn't like being empty. No. But Daddy was going to give him something else. He just knew...

His eyes widened and he bit his lip to keep from screaming when that hand began to push in. While he had bigger things inside him... There had been none of that recently. Not since he mated with Sherlock. Ohgodyes.

[seaweed_writes]

Sherlock went very very slow at first. "Look at you, my little one. You are taking my entire hand like a champ. I am so, so proud of you. Are you okay, John? You have to tell Daddy that you are OK before I move faster or deeper."

"Do you want me to continue, my love? Use your big words."

[ihadabadday]

John swallowed and took a breath. "I'm okay Daddy..." he told the vampire, "Please don't stop."

The pressure was intense, but it only made him want more. More of his mate, more of the stretch. Maybe the dragon dildo. Forced to ride it while he sucked off Daddy.

[seaweed_writes]

"Good boy." Sherlock beamed. The shower was still beating down on them, thankfully it was still hot- thank goodness for the water heater. He shifted so he was a bit more under the water flow, which also pressed himself against John, so John could feel Sherlock's hard cock against his back.

He started to move his fist in and out of John's arse, moving it deeper and faster now. each pushed brushed against his prostate and stretched him a bit more. "Good boy.. Such a good boy. You are taking it so well, nice and tight around my hand. You aren't going to come yet, are you? I know you won't because you are my good little slutty boy who wants his hole stretched, don't you?"

[ihadabadday]

John gasped and moaned with each movement of Daddy's fist inside him. Oh yes. Yes. He shuddered and pushed his hips back. Nothing more than a good slut for Daddy.

"No Daddy. I won't come. Not until you tell me. I want to be a good boy for you. I want you to get everything that you want from me."

[seaweed_writes]

"Oh, you are my good boy. I promise I want to make this good for you." It was such a strange paradox, that John could be in his massive Demon form, and still fall under and trust Sherlock enough to take care of him. It was a huge responsibility, and one that Sherlock took quite seriously.

Sherlock worked him open a bit more, using his wrist, and then the very first part of his arm inside of John, stretching him wider and wider.

"Look at my wonderful, wonderful boy. You are all stretched out around me, big and gaping and open, aren't you? I think it's time you got your reward. Do you want Daddy's cock in you now? I know I won't open you up like my fist will, but I can give you your sticky reward. Is that what my good, sweet, wonderful boy wants now?"

[ihadabadday]

John couldn't focus for a moment. He felt like he was floating, the pleasure so intense. It felt like it was going to overwhelm him. He sobbed and shifted a bit.

"Daddy please. May I please have your cock and my reward? Please?"

He pressed his forehead against the tile, trying to calm himself. It was so intense and he just... He wanted. He needed.

[seaweed_writes]

"Of course, my wonderful boy. You are so good for me, aren't you? You deserve everything that I can give you, and more."

Sherlock knew that he had to be careful, so he pulled his fist out very, very slowly, adding a bit more shampoo as it went to it would slide out with the least amount of resistance. When it finally released with an actual, audible pop, a steady stream of shampoo and water came with his.

He had to wait for a moment.. just to marvel at John. God, he had never in the almost year and a half that they'd been together, never seen him this open and stretched and fuck it was the hottest thing that he'd ever seen in his life.

"Mmmmmm." He couldn't resist leaning down and licking at John. He was so open that his tongue went right in, but it was a bitter taste of shampoo on his tongue, so he sadly abandoned that idea.

Instead, he took his cock in one hand and held John's hips with the other. No need to hold him open, he was so wide already. He did use a litlte more shampoo, just in case.

"Are you ready, my wonderful, lovely, open boy?" He asked, as he started to push in with a grunt. Between the shampoo and the gaping from his fist, Sherlock slid in with no resistance at all, right up to the hilt.

"Ahhh.. you feel so loose around me, not like your usual tight and hot hole. I wonder why. " He giggled while he started to thrust.

[ihadabadday]

John yelped when that fist was pulled out. He groaned and closed his eyes. Ohfuckyes. He could feel how open he was and ohgod. He wanted that cock. Any cock. He wanted his gaping hole filled up.

"Daddy please. Please fuck me. Put anything you want in my hole..."

He groaned when he felt that cock slide in. Ohyes. He shuddered and pushed back. He tried to clench around the cock inside him, but no luck.

He shifted, whimpering, holding the base of his own hard cock. "I could take the dragon cock with ease.."

[seaweed_writes]

Sherlock was rutting softly at first, loving the feeling of how loose John was around him. It was a strange sensation. There was still the slightest bit of friction, but he was very loose and would stay that way through this nice and easy fucking.

"Yes, you could." Sherlock said, with a rather brutally hard thrust, then he went back to his slower, more rhythmic pace. "But I was rather hoping that I would be able to fuck you and put my seed in your hole. Who knows. maybe you can be a good boy for Daddy and my seed will catch." He knew it was a very very long shot, especially just 3 months after having a child, but there was always a chance.