Skeið was getting sick of this cave.
Shifting from foot to foot just outside of the cave mouth, the blue-scaled lizardman had his legs pressed together as tightly as he could, his tail twitching back and forth. Eight hours! Eight hours he had been here with his whole life dictated by the tribe's elder inside of the cave. The elder remained inside while he prepared the final stage of the ritual, yet he kept a very close eye on Skeið, and on his mate-to-be, Vaskr. It was all part of one big scheduled ritual as they showed their dedication with other, smaller rituals to proclaim their eternal love for one another, swear to protect each other, and so on. Between rituals they were ushered out of the cave like this, and even their meal breaks had been strictly scheduled. There wasn't a single moment of respite during the whole thing – especially not for either of the lizardmen to relieve themselves.
The green lizardman that Skeið was going through all of this for was leaning against the cave mouth with his legs crossed in a similar state of need, and for the same reason: they had forgotten just how long the ritual was and hadn't made sure to come into it completely empty. Hunters like them could hold their bladders for a long time, of course, but this was a true test of their limits. Glancing over, Skeið saw the end of Vaskr's tail sweep back and forth across the cave floor entrance as he squirmed and held his hands to his loincloth, pressing them against his crotch.
It would all be over soon, at least. There was only one last bit of the ritual to go, and then they could finally go. A long piss on the outer cave wall wouldn't be the most romantic way to start their new life together, but there was no other way it could begin at this point.
The elder craned his neck forward, the tan-scaled lizardman peering closely at the carved stone dais in the middle of the cave, under the crack in the ceiling that allowed light to shine through. He had been looking at it over and over for quite some time, but finally, he seemed satisfied, seeing the edges of the light line up with the groove carved into the otherwise smooth and flat rock surface. "Come forth!" he commanded the other two lizardmen.
Skeið uncrossed his legs and entered quickly while Vaskr took a little longer to follow after him. Skeið's urge to just raise his loincloth and empty his bladder was strong, but he had to resist, and shuffled his legs back and forth to try and take his mind off of it. Vaskr wasn't faring much better, his legs pressed together as he bounced up and down on his heels.
The elder would never have missed such an obvious display. "Need I remind you," the old lizardman rumbled in a gravelly voice, "That this entire ritual must remain untainted?"
"Yeah, we know," Skeið answered quickly, not wanting further delays, taking a deep breath and shuffling around on the spot. "Sir," he quickly added.
Vaskr's bouncing paused briefly. "We'll be fine, sir, let's not wait and miss the opportunity," he told the elder, only to immediately resume his bouncing, his scaly lips pursed together tightly.
The elder gave them both a skeptical look, then stood straight and approached the dais. Was it just Skeið's imagination, or was the elder keeping his legs held tightly together too? "I would rather not do all this again either," the elder grumbled. "Skeið, Vaskr, approach me and we shall begin the Rite of Joining."
"Oh, thank the Great Scaled One," Skeið whispered to himself, then turned his head to the side. "Vaskr, let's fucking do this."
"Agreed," Vaskr murmured, taking a moment to squeeze his upper legs together as tightly as he could around the slit under his loincloth. Truth be told, Vaskr was only marrying Skeið because there was no-one else left, unless he wanted a mate far outside his age range. There was no animosity between them, but they had barely known each other until earlier that year. As Skeið pressed a hand against his slit through his loincloth, he only hoped that he hadn't leaked inside of his slit at any point during all this...
The elder cleared his throat and gave them a firm glare, and the two males quickly hurried forward. The elder's legs were bent at the knees and close together, but the old lizard's impassive face gave no sign of any discomfort... must've just been from his age, or so Vaskr thought. Vaskr rushed ahead of his mate-to-be to get up on the platform, standing in the middle of it in the expected position with his upper body bent over and his tail raised up high. Skeið approached Vaskr's hindquarters, placing his hands on the other lizardman's hips, but their needs made things difficult: Vaskr kept wriggling his hips back and forth as he squirmed, and Skeið kept shifting from foot to foot as he tried to grind up against Vaskr's rump.
"Vaskr," Skeið hissed, "You've gotta spread your legs."
Vaskr squirmed, but took a breath. "All right," he murmured back; he wasn't at all experienced with other men, so he followed Skeið's lead. He'd just have to hold it...
The elder began his intonations: "Under the watchful gaze of the Great Scaled One, today we witness the joining of..." but Skeið didn't pay attention for long, tuning out the rest of the elder's droning. With their attention elsewhere, neither he nor Vaskr noticed the elder reaching between his legs and squeezing with one hand for a few moments, continuing his speech without interruption. As Vaskr shifted his legs apart, Skeið lifted his loincloth and grinded up against the green ass in front of him, sliding his emerging shaft between the other lizardman's cheeks. At least being hard would make it easier to avoid pissing himself. It was hardly the first time he'd been in this position with another male raising tail for him, but he didn't normally have some stuck-up old grayscale watching him, or anyone else for that matter...
Skeið squirmed as he felt a pang of desperation in his lower body, and clenched his muscles as hard as he could to stop himself from leaking. The sooner this was over, the better. He continued to grind up against the squirming Vaskr, who was tenting his own loincloth as Skeið teased him. Both lizardmen's cocks had knots at the base, visible once they were fully erect and standing from their slits. 
"Be joined as one under the Great Scaled One," the elder proclaimed from beside them. "Skeið, only when Vaskr has received your gift shall I proclaim your bond to be forged."
"Workin' on it," Skeið murmured, prodding the tip of his cock underneath Vaskr's tail as he tried to get into the other lizardman. He found the small ring of flesh otherwise surrounded by ventral scales and began to press against it, drawing a breath. He could mate Vaskr properly later, but this would just have to be a quickie so they could both get it over and done with...
Vaskr shivered hard as Skeið began penetrating, pressing himself harder against the lizardman entering him. At first Skeið thought Vaskr's reaction was just from having his hole stretched, but Skeið's eyes widened when he noticed Vaskr's hand press into his own loincloth, gripping his cock through it. Vaskr gave a tiny whine, squeezing his legs together again.
"The Receiver is NOT to touch himself during the Joining!" the elder roared out. Skeið gave him only a momentary glance, but he was sure that the elder was shifting from one foot to the other as he observed. Skeið's thoughts were focused on Vaskr, however: Had he leaked at all? Would the elder notice? They had to hurry! He rocked his hips back against Skeið's insistently, silently begging him to hurry up, but it took every ounce of willpower that Skeið had to avoid a spill of his own...
"Is something the matter?" the elder asked. "Do you have some reason to delay?"
"N-no, nothing!" Vaskr answered quickly. "Just, um, overcome, with love, for my mate."
Skeið nodded rapidly. "Yeah, we've wanted this for ages. I've been wanting to f-... uh, join with Vaskr for a long while," he agreed, relaxing a little when the elder seemed to accept the answer, waving at them with one hand to indicate they should carry on. The moment the two youths weren't looking, the elder reached down and clenched his hand around his slit through his loincloth, drawing a sharp breath but giving no other sign of his need.
Wasting no more time, Skeið pushed his hips forward until only his uninflated knot remained outside of Vaskr's ass. But he had to grit his teeth, shifting about where he stood to fight off another strong urge to piss. He tried to ignore it as he started to thrust, but the pressure in his loins was getting unbearable, to the point that even being erect wasn't enough to stave it off. He had to keep going though, and just hope he could cum fast enough...!
But then again... maybe he could let out just a little bit now. As long as Vaskr kept it in, the elder would never know, right? What better way to truly claim his new mate? He'd be making a mess in there soon enough anyway. Of course, trying to piss while hard was incredibly difficult, but if he relaxed enough...
"Skeið?" Vaskr whispered, turning his head back as the man penetrating him went still. "What're you waiting for?"
"Stay quiet, I just need a moment," Skeið hissed softly. He rocked his hips ever so slightly, waving his tail to make it look like he was thrusting more than he actually was.
"What-" Vaskr began, only to hear Skeið let out a low exhalation behind him. His aching bladder tingled as he finally gave it a little bit of relief, releasing a thin, hard stream of piss into the other lizardman's anal tunnels. Vaskr trembled and barely muffled his cry of surprise into only a tiny squeak, his eyes widening as he realized what was happening.
"Skeið, stop it!" he hissed, a little too loudly. "Pull out!"
The elder cleared his throat again, even louder. "The Great Scaled One does not approve of mischief within His cave!"
"Okay, okay," Skeið conceded. Surely that little bit of relief would be enough? He clenched his muscles hard enough to cut off his stream and pulled out from the squirming Vaskr gently, gritting his teeth together. His bladder did not appreciate its relief being denied while it was still so full, and he could feel its protests, clenching his muscles again to stop himself from spilling. "Sorry, Sir. I'll try again in just a..."
But he had forgotten that Vaskr had never bottomed before, much less had someone piss inside him, and he didn't know how to hold it properly. Vaskr's legs trembled as he let out a little groan, while Skeið's own piss spilled back out from his sphincter. It flowed down his underside to the lowest point and then began dripping off heavily onto the floor, splashing obviously enough that the elder could not possibly miss it.
"Sacrilege!" the elder lizard bellowed. "The Joining has failed! YOU have failed! You have defiled the Great Scaled One's chamber and..."
But Skeið wasn't paying attention. Vaskr clearly wasn't either, as Skeið's would-be mate lowered his hips to let the rest of Skeið's urine spill out from his ass. Yet Vaskr couldn't hold himself any longer up front either, and he trembled as the final drops leaked out of him, bringing his hands to his loins and trying to squeeze his cock through his loincloth.
It wasn't enough, and soon Skeið heard and saw Vaskr's own piss as it sprayed against the inside of his own loincloth, splashing on the back of the leather covering and then running down to drip onto the dais that Vaskr was squatting on. Vaskr was trembling as he wet himself, either unaware or uncaring that his feet were in a growing puddle of his own piss, mixed with a bit of Skeið's.
Skeið gritted his teeth. The splashing sound of liquid was the only thing he could register, totally tuning out the elder's angry speech and Vaskr's groans. A strong wave of desperation hit him, made all the harder to resist after cutting off his stream earlier. It was bad enough that Vaskr had already wet himself!
The blue lizard did all that he could: he put both hands between his legs to grab and squeeze his cock, he pressed his legs tightly around his hands, and he hunched over. Everything to try and avoid pissing himself. And it worked... for a few seconds. Just as he thought he was safe and began to relax, he felt wetness against the tip of his dick and panicked, clenching hard again after his accidental brief leak. He gritted his teeth, shuddering from head to toe, but ultimately it was to no avail.
Another brief spurt hit the inside of his loincloth, and for a moment he fought harder, stemming the flow for just a few more precious seconds until he could hold it no longer. A torrent of his own urine sprayed hard against the inside of his loincloth and spilled down it, reaching the insides of his legs and running down the scales there all the way to the ground. He shuddered and panted as his bladder emptied onto himself, yet he couldn't bring himself to move or take his hands away, just standing in the expanding puddle of his own urine.
In front of him, Vaskr had his head bowed as his underside and loincloth dripped, the latter far more regularly. "S-Sorry, elder!" Vaskr begged, "I-It was my fault! I-I can clean up and we can try again...!"
"N-No, it was me," Skeið forced out, trying and failing to stop his uncontrollable stream as his far-from-empty bladder continued to release its contents, his muscles too exhausted to stop it, his legs soaked from his own piss. He didn't want his lover to take the blame. "I thought I could get away with a little relief, I'm sorry."
"No, it was my fault, I should have remembered-"
"I'm the one who-"
"Silence!" The elder lizardman roared, and both of them went quiet, the cave silent but for the splashing of piss against the stone under them. "The ritual is no more. The Great Scaled One is ashamed of you both! Perhaps the two of you will train better to try again next month – but for now you are both disgraced! Get out!"
Vaskr crawled away before getting up into a low crouch to hurry off, with Skeið following after him, leaving a trail of piss along the cave floor. There was always next month, but it was still unlikely they would live this down for a long time yet.
The elder watched the two of them go with a glare, then a disapproving look at the puddles and wet spots on the dais. The fools! ...but at least he hadn't been the one to cause the ritual to fail. With the other two out of sight, he reached under his loincloth and felt around inside of his slit with one finger. He was not surprised to find it was quite wet.
"As I suspected..." he murmured to himself, "I'm getting too old to be trying to hold it for this long..."