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"So you're absolutely sure this is safe?" One head spoke up to a large creature that stood so much taller than them.

To describe the scene as normal would not have been possible. Even the very two creatures that sat down in a large home were unusual. One creature was a two headed coyote anthro, a male one that looked up at the other creature with a faint smile on one face, and a look of uncertainty on the other. The two heads were technically one person, but could often have different emotions from one another when they were unsure about doing something. For the moment, they very much were unsure as they looked up at the giant twin headed leviathan.

"Oh, you know it. You won't become a full cock, you'll just become part of a shaft." One of the two leviathan heads responded.

"Think about it," The other head added. "A two headed part cock coyote on a two headed leviathan like us." The herm pointed to herself proudly, the other head smiling as well. "It would be so sexy, and we could have all kinds of fun masturbating. We don't even have to change our sizes! You'd be the same size, just as a cock. The conversations you could have with others would be amusing, don't you think Dom?"

Dom, the two headed coyote, had the same thoughts in their heads that it would be amusing. Heck, Asteria and Cordelia, the two headed leviathan, could easily take care of them. Moreover, he wouldn't have to worry about eating or anything as a cock. He could enjoy the pleasures of masturbation on a whole new level! He had already thought a lot about it already though, otherwise they wouldn't have gotten as far as they were now, both naked with Dom in the lap of the 40 foot creature. "Heh, well... okay, before I change my mind, let's do this. We can always undo it like you two said." After a short pause, one of the heads added. "Unless one of you tells the truth and one of you lies."

"You know us enough that we wouldn't do THAT." The leviathan gave Dom a hug before raising the two headed anthro coyote up with one hand. All four heads gave one another a loving kiss before, with one hand, the two headed sea serpent anthro lowered Dom onto their cock. While the leviathan had two heads, they only had one massive cock between their legs with testicles so swollen that it went down to their knees. With their height, the leviathan's cock alone was taller than most people. The way they sat hid their cunt, though they lacked tits for their sex. "Now, are you ready for the experience of a lifetime?"

Just as both of Dom's heads kissed the serpent and grinned up at them, both nodded at the same time. They were a bit unsure at first. Heck, even the sight of the creature's massive cock was enough to get Dom's heart pumping with fear, but also excitement. He could feel that huge shaft between his legs. There was no way that cock would fit, but using their ability of symbiosis and melding, he could be fused with it.

The leviathan pushed Dom down his cock. With the help of his symbiosis ability, as well as a little massage of his hands, Dom's rear slowly parted for the duo's cock. Both Asteria and Cordelia let out a moan as they pushed the two headed coyote down their cock. It looked as if a massive bulge appeared at Dom's crotch, stretching his waist into a cylinder shape. With one hand, he worked Dom down his shaft. With his other hand, he stroked Dom's legs, fusing them to his big black cock.

Dom's heads watched the fusion happen. They could smell the dragon's musk, a scent that smelled like the salty ocean, and it was a scent that grew stronger as his body fused with the cock. The cylinder shape raised up their body, but it didn't feel as if they were penetrated. Rather, they were becoming the very thing that was inside of them. Their legs melded into the cock and they could feel the pulsing and throbbing inside of them, becoming part of them. "Oh... oh fuck." One of the heads spoke breathlessly. Two of their hands stroked the leviathan's body.

"Mmm. It feels so nice, doesn't it?" Cordelia's tongue lolled out of their mouth with joy while Asteria had a look of pure bliss on their face as the fusion continued. They pushed Dom down with one hand while adjusting his shape with the other. Dom's body continued making it's way down the leviathan's cock, but their shape wasn't changing above their chest, even though they had been pushed down so much that the sea serpent's cock would have pierced their whole body by now.

"How big are we going to make you now? How close do you want to be to our balls?" Asteria asked.

"As close as possible." One of the Dom head's replied, while the other fiercely nodded in agreement. The two of them looked so happy with their tongues out and grins on their faces. Both raised their heads and let out a moan in unison. "I want to feel your cum flow through my body!" The other added. "Ahnnn!" The first one went as the cock continued to throb. With more interior connections made, it wasn't long before the four became two, and as the huge cock throbbed, Dom would throb with it, connected with that cock more and more as the fusion continued.

With a grin and a nod, both Asteria and Cordelia pushed Dom down to where only a hint of the snake's black cock stuck out from underneath them. The exterior changes looked finished, but the interior changes were still doing their work. The inside of Dom's body was being simplified. Lungs, heart, other organs, none of those things were things a cock needed. They'd keep the upper half of their body, but lose most things underneath it. With the way the two of them absorbed Dom onto their cock, they would be a lot more cock on the inside than they appeared to really be, though by an exterior glance, one might think the fusion was only halfway done.

The two of them were fully fused together, and with a stroke of Dom, the leviathan moaned happily as they could feel their connection complete.

With a few more strokes, cum flowed through Dom's body as the four of them experienced their first of what would be many, many happy orgasms to come.

Both of Dom's heads felt the pressure build more and more until they couldn't control it any longer. The white warm seed flowed through their body and they happily came from their mouths, spraying the leviathan seed everywhere, giving them a full body orgasm so intense that thinking during their orgasm was a virtual impossibility. Oh yes, they definitely would not mind staying this way for some time. The taste of the sweet and salty seed filled their mouths while their minds blanked. Even when they stopped cumming, they glowed with the aftermath of cumming, the massive balls below them throbbing, ready to cum again should they so want it, and neither of Dom's heads would complain if Asteria and Cordelia wanted to do just that.

The rest of the night was filled with pleasure and sensational love on a level so rarely felt by others. The leviathan stroked and masturbated with Dom, orgasming time and time again. Their big huge white balls quickly refilled with more seed for Dom to spray out of his two heads. By the end of that night, they made a massive mess of seed everywhere, but it mattered not. They fell asleep on the large bed with all four heads having a huge smile on their face, and Dom's heads dripping cum from their mouths while they all drifted to sleep.

The next morning, Dom was the first to awake. With their two heads, they glanced around. They then pulled themselves up with their four arms and looked down at the cock they were still fused with. They could feel the leviathan's heart pulse softly, a connection that was like no other as they had the same heart, the same body. No longer were they just two heads, but part of a whole new being, and it felt so good. Dom found it hard to bend his back, and he could only assume it was for one reason. Asteria and Cordelia were definitely a horny couple.

Unable to help themselves, Dom tilted down as far as he could and rubbed Asteria and Cordelia's massive testicles.

Dom could hear the leviathan's heart pump faster as Dom grew more and more aroused, purely because of how turned on Asteria and Cordelia were getting.

'I bet I could make him orgasm just from doing this alone.' One of Dom's heads thought, and the other agreed with a grin and a nod. The two of them toyed with Asteria and Cordelia's massive testicles more and more. As the leviathan grew aroused, they found it harder to toy with his balls as they were forced upwards. It became impossible to toy with the bottom of the balls with their four hands, but they found massaging the base of the cock, as well as even themselves, made Asteria and Cordelia moan with arousal.

After just a few more moments of stroking themselves, they could feel the pressure build and the taste of cum growing strong. The scent of seed was also growing powerful, and it was getting hard to think for both of Dom's heads as they tilted up and began to leak cum from both their mouths. One more stroke, and Asteria and Cordelia slowly awoke to a mind blowing orgasm from Dom blowing load after load of seed onto their flat chest.

Orgasms as a cock were still as pleasurable as ever. While undoubtedly great for Asteria and Cordelia, it numbed the minds of Dom as they came, shooting blast after blast of seed from their maw, soaking themselves in cum.

Once the orgasm slowly stopped, both Dom's looked up at Asteria and Cordelia with a huge smile on their face, breathing in and out heavily, though they had been so transformed inside it hardly mattered, they still felt hot and exhausted after an orgasm, which most cocks did.

"Good morning." Both Dom's said.

"Heh... heh... can we wake up like that every day? Asteria replied while Cordelia nodded in agreement. They pulled themselves up, stretched, and went about their morning routine, just with a special cock between their legs. "How do you feel about being a cock?" Cordelia asked the duo as they walked into the kitchen and prepared breakfast.

Dom wondered if he had to even eat. He doubted he had a stomach, though he had a mouth. Then again, he didn't want to orgasm any food out from his maw either. Unless food made him cum more, in which case he wanted to get stuffed. He had no idea how being a cock worked when it came to... well, anything! He wanted to learn though. Besides, he was in a very comfortable place. Even if their mouths were full of seed.

"Love it." One Dom head replied. "I'd love to be this way forever!"

"That can be arranged." Cordelia grinned down at Dom and gave the two heads a slow pet while Asteria focused on making food.

As time passed...

The next few weeks were fun for the four and full of masturbation. Asteria and Cordelia even convinced Dom that they should make a tub full of cum! The tub took a few weeks to fill, and during that time, Dom was starting to wonder about his old life. While being a cock was interesting, it was... sudden. He tossed his old life behind and part of him wanted to go back, but a month later when he requested it, Asteria and Cordelia had some unfortunate news...

"What do you mean I can't go back?" Dom shouted with a look of fury.

"You've been fused with me for too long. It would kill you for me to try to reshape you." Asteria and Cordelia admitted with a frown. "You said you wanted to be my cock forever, so I thought you wouldn't mind if you really were."

Dom's heads sighed frustratingly. They did like being a cock, but now they really did throw their old life away for a life of perversion and pleasure. It wasn't a bad life as a cock, but he wished there had been more warning about that. He had a time where he could go back, but now he was stuck as a cock, forever. "Unbelievable..."

"We'll take good care of you." Asteria and Cordelia said in unison with a smile down at them. "And we'll both do whatever we can to help you feel better. We'll let you do your own thing every now and then. It's the least we can do. It just might be... well I hope you don't mind not being able to dance." Asteria stroked Dom's heads. "Now, I know you're angry, but how about we talk about our future plans? I have a great idea that you're just going to love."

Dom looked up at Asteria and Cordelia with a look of rage, but they had a good point. It wasn't bad being a cock, and if they were willing to work with Dom, then maybe things could work out in their own way... he loved Asteria and Cordelia too much to be angry at them for long. "Okay..." Dom's look of anger slowly turned into a soft smile. Asteria and Cordelia always did have excellent ideas. He was curious where this would go.

One year later...

One full year had passed since the two, or four fused together. By now they had gotten accustomed to it. They'd sleep together, eat, use the bathroom, masturbate, everything Asteria and Cordelia did, Dom was doing too.

Asteria and Cordelia awoke in the morning with a stretch and a yawn. They slept on an old style waterbed in their home that was very much underwater themed. Dom was still between their legs, and the leviathan was wearing nothing to cover them up. "Mph..." Asteria stroked Dom's back. "Morning Dom."

Both of Dom's heads awoke at the same time, and both groggily at first before they stretched all four arms. "Morning." They spoke in unison.

"Uhn... any plans today?" One added.

Cordelia shook her head. "Not unless Asteria made some without me. It's just us and our fun little masturbation sessions." The leviathan stood up and walked to the bathroom with Dom between their legs. They didn't bother holding Dom, but their erection from the morning kept Dom nice and pointed upwards anyways. "Did you two want to do anything?"

"We're your cock." One of Dom's heads said with a chuckle as they got into the bathroom. "We do whatever you two wanna do, really." The other head said.

Dom's heads grabbed two small toothbrushes from the counter, filled the bristles with toothpaste, and began brushing. They might have been the cock of a leviathan, but hygiene was important! They'd just never be able to get rid of the musky smell that their body gave off instead of their normal scent, but it was a small price to pay for being a cock.

Asteria and Cordelia grabbed their own toothbrushes and the four of them began to brush in the mirror. It was a sight to see with a half-cock that had two heads brushing its own teeth. The four of them spit their toothpaste into the sink with total unison, and then Asteria and Cordelia walked into the shower and bathed while stroking Dom.

One of Dom's heads developed bloated cheeks. He unleashed a small burst of cum, and raised his head up to the leviathan. "Hey! I just finished brushing!"

Asteria chuckled and patted the one head that complained. "Sorry. I couldn't help myself. I was thinking of that one woman from a few nights ago that you met. God she was cute... you really should have taken her home with you."

"It's kind of hard to take people home with you when you're attached to a large powerful leviathan." Dom replied with his right head. "I mean, even if I did, we can't exactly fuck any more." Dom looked between his legs and saw nothing below his waist except the cock that belonged to leviathan. He stroked himself from his cylinder shaped furry chest down to the scaled shaft that was Asteria and Cordelia's cock.

Over time, he learned that the leviathan was pansexual too, which was a blessing for Dom.

"We've been over this. You give them oral, I orgasm, and that's how pregnancy works." Cordelia replied. "I can't guarantee they'd be coyote anthros when they're born though."

Dom knew there would be some... complications when they became a cock, but he had never imagined how awkward his life would get. He was literally attached to a leviathan and had to do whatever they wanted. Sometimes the leviathan would let Dom do a few things granted. For a cock, he was very open. The nights they spent masturbating were always fun too. There were times he wished he could not be a cock anymore, but that was now impossible.

He remembered the event a month after being his cock, he was told that it was impossible to turn back. Unmerging was no longer a possibility. He was part of the leviathan forever, to be forever the cock of the 40 foot tall creature. A cock life wasn't a bad life though. There were benefits to being a cock as opposed to being his old life. Orgasms were always mind blowing, no matter how many the leviathan did. He could feel the leviathan's heart throb with arousal, keeping him erect. "Well, it would be kinky to impregnate someone that way." One Dom head replied. "But... let's not get things more complicated."

"Heh. I think finding a two headed woman and having sex with them so they'd have twins that have two heads each would be a very fun thing." Asteria and Cordelia chuckled together while Cordelia spoke, and continued. "If you're not going to give someone oral, we can always find someone my size and we can fuck them."

Dom remembered the time they actually did do that. The first time he was stuffed in a vagina and used just as a cock. Heck, Asteria and Cordelia used toys too! The feeling of being in a hot, wet, constricting space made him orgasm so quickly, but he wanted to blame Asteria and Cordelia for that. He had been given... a few strange fetishes that he swore he got from the leviathan. Things that never turned him on were now more arousing than ever. He could tell when Asteria and Cordelia got excited, and that got him excited in return. "I suppose we have to do that sometime, don't we?"

"That we do." The leviathan stroked Dom. "It's only been a year, but it still felt like such a short time. Now, I have an idea. How about we go out back and work on that pool?"

Dom's heads glanced outside to see the massive pool they had been working on. A large pool big enough for multiple 40 foot tall leviathan creatures, filled around one third of the way with cum, something that they had been working on for some time. It was easy to get Dom to cum, not that he was complaining about that. With a huge grin, both heads nodded. "Sounds like a plan."