This story is contiguous with the previous one (Jack and the swamp).
I hope you will enjoy it! Let me know in the comments!
(Sorry for my poor use of English, it isn't my native language)

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Mike at Jack's account was speechless. He had always considered himself an open-minded man however such a turn of events, after what he thought had been a usual canoe outing by his boyfriend, he had never expected. He wrinkled his brow and was silent for a couple of seconds. Jack was sitting before him as if it were a normal dinner, yet a new light shone in his eyes, a mix that exuded great transport and a truly irresistible desire. Although not completely convinced by the proposal Mike's face became reassured. He had always trusted his partner and even though the proposal seemed out of the box, he said, "If you tell me it was such an overwhelming experience, I believe you. Tomorrow I'll go with you but I'm not promising anything-I'm not so sure I'll like it as a thing."
Jack smiled contentedly. Convincing his boyfriend was often a difficult task given his stubbornness but he had learned how to break through his thoughts. Mike was a much taller man than he was, with broader shoulders than his own, and although he was not a sports fanatic he had pecs on which Jack liked to rest his head every night to fall asleep. What had most excited him in the past on their first date had been her eyes as blue as a winter day's morning sky and her dark hair with that military cut that unintentionally offered that air of trustworthiness and confidence that Jack had always admired in his partner.
They went to bed early without touching the subject again, and the next morning, having had a light breakfast, they took the double canoe. Mike wore only his old short sleeve leotard and Jack one of those tight-fitting sports shirts that he knew would be a plus in convincing Mike. They went into the lagoon paddling vigorously as the current was against them. Jack sat in front and set the pace while Mike did his best to keep up with him. The July sun immediately warmed the lagoon air and the two soon began to struggle. From behind Mike could smell the strong scent of his partner's deodorant and thought that even if the day did not end as Jack hoped, they could always find a beach away from prying eyes where he could have sex with him. After all, he had brought along everything necessary and even some lunch should the place be comfortable enough.
Jack as soon as he glimpsed the islet, oblivious to Mike's thoughts, increased his pace without realizing it, almost as if it had become a race, so much so that they reached the shore with enormous energy. He turned to Mike and said with a mischievous look:" if it is not a problem for you I would undress directly here before going ashore...." At the mere utterance of these words Mike had a spontaneous erection and, pretending not to, said believing himself airtight and shrugging, "You are the expert." Jack caught a note of excitement in his voice and turning to the shore he smiled and began to remove his costume.
Mike was beginning to feel a thrill of excitement, he had always liked the idea of doing some nudism with his man and relishing the opportunity he took off his leotard. His tanned physique glowed under the sun and his blue-sky eyes sparkled at the sight of Jack's bare bottom in front of him. He reached out his hands to caress it but Jack, swiftly rose to his feet as he got out of the canoe and sank into the ochre-colored mud. Mike was not hurt by this and kept his focus on his goal: he also got out of the canoe but because of his greater weight he sank a little more than Jack and almost lost his balance. He did not give it away and quickly came up and hugged him from behind making him feel his erection externally on Jack's butt. The latter, feeling embraced turned his head seeking Mike's lips, which he immediately found there, ready and waiting for him, soft and enveloping, under that soft beard that surrounded his mouth. Mike was already ready for action but Jake told him, "no, not here, not yet, trust me!" and escaping from his embrace he advanced with his hands closed, as if he were hiding something in them, toward the hole in the swamp he had formed the day before. Mike followed him, advancing with difficulty through the mud but as determined as a hunter who by now has already sighted his prey. A moment before he took that step that would sink him, Jack turned to Mike and opening his right hand said," I want you to use this vibrator. Know that I have the remote control and I will choose the intensity." Mike grinned, he liked a challenge and now it was about to get really hot...the vibrator was already lubricated and with a grimace he shoved it up his ass. The erection he already had intensified and Jack seeing in his partner's blue eyes a look of ecstasy also had an immediate erection. He then literally jumped feet first into the swamp that engulfed him until it lapped at his testicles. This sent a huge wave of pleasure through him and he slowly began to move his legs to activate the sinking.
Mike won all prejudices and forgetting from his alternative plans, in one step he too joined Jack in the swamp. Excitedly he made Jack bend forward with the intent to penetrate him immediately but Jack resisted and told him, "don't be hasty...you must enjoy this experience as I say: first I want you to sink at least a little more."
Mike gritted his teeth but wanted to please his partner and began to move his legs as well. The black embrace of the swamp began to envelop them both and the mud absorbed both of their testicles beneath the surface. Mike finally understood why Jack had been so insistent the night before: the touch of the swamp on his cock was something indescribable. Precum began abundantly to flow out of his big cock, settling on Jack's bottom.
Jack turned his head and with a lustful look said, "I told you you would like it ... now you make a mess inside me!"
Mike didn't let him say it twice and stuck his cock into Jack's muddy ass. The sensation overwhelmed him. Jack began to move on him and with each movement they both sank deeper and deeper into the black swamp mud little by little. Jack activated the vibrator in Mike's ass and putting the remote control around his neck slipped his hands into the swamp behind him in search of Mike's ass. Like a bull overwhelmed with excitement, Mike increased the pace and with his hands covered in black mud began to caress Jack's hairy chest, who winced at the contact of the mud with his skin. His nipples became turgid and his cock also began to leak copious amounts of precum. He felt mike's big penis hitting him repeatedly near his prostate and his cock at the front, enveloped in the black mud, felt as if it were being licked simultaneously by thousands of tongues. By now the sludge had reached just below both of their shoulders and Jack knowing that he would no longer be able to resist pulled his hand out of the bog and grabbing the remote control of the vibrator that was in Mike's ass increased its intensity. Mike moaned and with one last lunge, penetrated Jack completely touching his prostate perfectly, making him come and cumming copiously inside him. With his arms he held him close as both of their cocks repeatedly released their loads into the depths, Mike inside Jack and Jack far below in the swamp.
They lay still, panting, mud up to their necks, Jack with his hands still on Mike's ass and Mike with his arms still around Jack's chest. They clutched each other while the mud coated their bodies in black and held them togheter in its heavy, enveloping embrace that enveloped every inch of their bodies.
Jack turned and kissed Mike passionately. He smiled at him and said, "Now you know where we will spend a good part of our vacation."
Mike laughed contentedly and with his head nodded.
With difficulty they freed themselves from the grip of the mud and all black, with their cocks still dripping with cum and mud they squeezed each other gluing each other with the sticky black slime that was slowly drying in the sun.
Before washing in the clearer water, they spent some time hugging each other on the shoreline as the black mud solidified on their bodies, welding them together.
The summer ahead of them would be wonderful