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High on more than stone-age opium

Summary:

Spoilers from season 4!!

This is part of a series (let's call it the stone-age opium series XD)
The first two-shot (" Effective opium [in the stone-world]") was explicit none-sexual content, but I decided to make an alternative sexual continuation (if you want to call it like that :D)

So if you're interested in #sexual omorashi then start with "Effective opium" and continue with this one-shot, which actually makes it an "opium"-three-shot XD

Oh and whatever "relationship" SenGen has here it's definitely growing :D

Notes:

For understanding (if you didn't read the none-sexual two-shot before):

This is taking place after the sniper attack on Senku. With the addition that Gen is there to keep an eye on him while he's recovering from his bullet wound.
For pain relief they gave him some opium poppy, which unexpectedly resulted in Senku having severe issues with his bladder control, while being bedridden ...
Gen is trying his best to help him and is overcoming his own discomfort with the subject, during this process.

The main focus of this one-shot is the realization that the final release is giving Senku unwanted, but very much existing pleasure, leading to the scientist learning something knew about himself and his body ...

Work Text:

Senku slept for another hour until he started stirring again.  
Well, actually it was his body stirring, while his mind and conscious were seemingly still stuck somewhere between being aware and unresponsive.  

“Senku.” Gen’s hand was already on the scientist’s shoulder before the squirming fully started.  

“G-Gen!”, Senku startled awake, this time right away, but it still felt like not quick enough. It was actually scary how the opium didn’t seem to allow him to wake up until the very last second before he was about to wet himself in bed.  

“It’s okay, stay down.” Gen tried his best to keep him calm, but the urgency was written all over Senku’s body, when he threw the blanket aside.
“I’m here, we’ll do it like earlier. To the side.”
 

Senku was panting in exertion, both hands at his crotch to squeeze his dick tightly through the fresh towel Gen thankful had place there after cleaning him. But the hold wasn’t enough.  

“Ahhh-”, Senku gasped, when the first spurt of pee pushed past his fingers.  

“It’s okay. It’s just the towel.” Gen tried to avoid him from making any sudden and harmful movements to his healing wounds.  

This was humiliating!  
Senku could even see the bucket while Gen was positioning it against the edge of the bed, but he just couldn’t hold it. 
Despite the tight grip Senku had on himself there was a steady trickle of pee leaving him, before it was being absorbed by the towel.
 
Something close to a breathless whimper escaped him, while his eyes were starting to burn.  
Why did this have to happen again? Hadn’t one time brought enough uncomfortableness already?? It couldn’t be pleasant for Gen- 

“Senku? You have to roll onto your side. Come on.”  

“I- can’t-”, the scientist's voice sounded choked and in pain, while his whole body started trembling.  

“Yes, you can”, Gen encouraged him, reaching for Senku’s shoulder. “Come-”  

“I can’t- m-move-” The scientist looked close to crying. “-it’s c-coming out!”  

Gen tensed. Was he just imagining it or was this time even worse than the one before, when Senku had been awake as well? 
Was he in more pain or simply more awake now? Either way it was hard to watch Senku this upset.  

“I-I’m wetting the bed!?”, he gasped in panic, when the trickle turned into a steady stream against all his will to stop it.  
“G-Gen- please h-help me!!?”, Senku cried out in pure horror. 

“Okay. Okay. I’m here.” He grabbed another towel when he noticed that Senku was indeed about to wet through the first one. “Here, take this one as well. I’m going to turn you to the side now.”  

“N-No-” It came as a broken sob over Senku’s lips, when he took the extra towel to press it against himself. He knew as soon as he would be moved, even the last bit of control would get ripped from him and he would instantly drench everything in pee.  

“Yes, Senku. You’re in way too much pain right now. Also, you’re already actively wetting yourself. Just keep the towels where they are and I’ll do the rest. Everything’s going to be okay. I got you.” 
Gen momentarily placed the bucket on the bed to have both of his hands free. 

“On three. One, two, three-”  

“Gaahhh-” Senku yelped, feeling the dam breaking completely the moment his body got jolted to the side. 
He didn’t even notice the tears falling, only sensed how pee was basically exploding out of him, drenching everything inside his hands including his palms.  

“Shh shh ...”, Gen tried to sooth him, slightly overwhelmed by the agony Senku seemed to been in. “It’s okay Senku. Let go. It’s okay. You can let go now.” 

Only with a lot of effort Gen managed to pry away Senku’s tight grip on himself and the towels, no longer caring if he got pee on his hands. The mentalist even dared to take his spurting dick, aiming it directly into the bucket after removing the towels and putting them aside on the floor. 

The sound of liquid hitting liquid inside the bucket was what finally brought Senku back.  

“Good, that’s it. Let it all out. It’s okay Senku ...”, Gen said, when the scientist’s stream eventually became more evenly, due to him no longer trying to desperately cut it off with every strength that was left in him.  

“Ahhhh ...” Senku couldn’t hold back the loud moan that escaped him at the pure relief. 
Even though he had already soaked the towels with quite the amount of pee inside him, his stream didn’t want to stop.  
It went on and on, while Senku was panting and moaning audibly, not even aware of Gen actually still aiming for him. 

“Haaaahhh” Senku’s eyes were closed, while he kept on relieving himself in pure bliss into the bucket. His body was shaking noticeably, all shame forgotten for the moment.  

“Damn ...”, Gen’s breath hitched. How much had Senku tried to keep inside of him during this last hour?? 
Gen blamed it on the juice Francois had made. What the hell had the butler put into it to make Senku’s kidneys work overtime like this?! 

Another audible moan escaped him, when his stream finally slowed. It still kept going and so did the feeling of overwhelming relief, but the intensity was slowly fading. 
“Mhhaaa ...” Senku couldn’t hold back the noises, it just felt too good ... 

It shouldn’t. Like the time before, but it did and there seemed to be nothing that was strong enough to stop this feeling. Not even shame. 
All that mattered right now was the pleasure it brought him to let go ... wait- 

“Oh ...”, Gen’s gaze had fallen onto his hand the first time he had felt movement. He had blamed it on the relief then, trying to ignore the little twitches of Senku’s dick between his fingers. But the growing erection was becoming more and more obvious, and Gen started debating if he should better let go. 

Was it actually him holding Senku, that caused this kind of reaction?  
Gen didn’t think so ... That would be new. They didn’t share this kind of attraction to each other, did they? 

Senku flushed a deep crimson red, when he realized that Gen was actually holding him in place. 
How had he not noticed this before??! 

What made it even worse was the obvious erection that was growing in between the mentalist’s fingers. 
Why was this happening?? This was by far not an understandable situation to be aroused or even get hard ...!?? 

Normally Senku wouldn’t be bothered by body functions he only had limited control over. But together with Gen, like this, and with the drug still cycling inside his system – making him feel less like himself - ... it suddenly bothered him a lot. 

“I- I-”, Senku stuttered, not knowing how to continue though. 
The last trickle of pee was running into the bucket, filling the uncomfortable silence that rose inside the room. 

“Do you ... need me to let go?” Gen asked hesitantly, since Senku was still not fully done emptying his bladder.  

“I- ...” Senku didn’t know. It wasn’t the first time Gen had touched him in this rather intimate spot today. The scientist was oddly getting ... used to it? Could he even think that?! 
God, this damn improvised pain medication. It seemed to mess with his head a lot. Senku absolutely didn’t appreciate that. 

“I- don’t know what’s ... going on ...”, Senku’s face was still flushed when he tried to somehow explain himself, even though he had no clue how to do that. 
Everything about this was ... weird and- and wrong! 
“I’m not- ... this is not-”, the scientist searched for words but didn’t find them. 

The worst part was, that he could still feel the pleasure inside of him, which the immense relief had caused, and it kept him half hard in Gen’s hand. 
He didn’t want this! Why couldn’t all of this just stop?! 

“Are you done?” Gen ripped Senku out of his spiraling thoughts after the last dribble had ended up in the half full bucket and Senku’s bladder was seemingly finally empty.  

There was another pause, as if the scientist was making sure before he gave a rather shy nod.  

“Okay, I’m going to help you get clean again”, Gen said.  

Senku drew in a sharp breath, when Gen’s hand moved on his dick, causing the mentalist to freeze.  

“Did I hurt-?” His eyes shot up to Senku’s face, not needing a verbal answer though. “... oh.”  

If possible Senku became even more red, mortified about his body’s reaction, he couldn’t control. 
God, he felt like he could die of humiliation right then and there. 

“I’m sorry, I’ll try to be careful with the cloth”, Gen promised, sensing the intense embarrassment that seemed to not only radiate from his flushed face, but the scientist’s entire body.  
But he had to get Senku clean. It didn’t look like he would be able to do it himself with the little strength this accident had left him with again ... 

As careful as he could, Gen started running the wet cloth over the soiled area, but at some point everything, except for Senku’s dick and beneath, was clean and the mentalist had no other choice than to move on to the still noticeable erection. No matter how uncomfortable it was making Senku. 
Gen was actually surprised that his own discomfort had just ... disappeared. It was almost like the need to care for the scientist had erased everything else from his mind. 

“Ahhh ...”, Senku gasped when the cloth finally came in contact with his pulsating dick.  

“I’m s-sorry", Gen whispered apologetically, hearing Senku’s breathing increase, “There’s more on and beneath it ...”  

The scientist was flushing in a deep crimson red, his tongue trapped in between his teeth, but the hiss left him nevertheless. 
This was beyond humiliating.  
Not only was he too exhausted to clean himself; he also was hard, after something that absolutely shouldn’t have caused this involuntary reaction of his body ... 

“G-Gen-”, Senku almost choked at the way he basically just had moaned the mentalist’s name.  

Gen’s hand froze. His gaze wandered up to Senku’s face. The scientist looked mortified.  

“It’s- ... it’s okay Senku ...”, Gen somehow tried to comfort him. He couldn’t even imagine how uncomfortable Senku must be feeling in this very moment.  

“N-No-”, Senku choked out, his normal carefreeness - about anything that wasn’t connected with science – nonexistent, when he felt his squinted eyes starting to burn. 
Nothing about this was okay!?! 

“You- ... this looks like it’s bringing you a lot of discomfort ...”, Gen started carefully, “Do you ... need me to help you with-?”  

“W-What?!”, Senku’s eyes ripped open half in shock, half in disbelieve, causing Gen’s cheeks to flush in a similar crimson red as his own.  

Gen should have kept his mouth shut and tried to find a different solution. Looking away so he wouldn’t have to see the expression on Senku’s face, the mentalist felt the burning heat on his cheeks spreading to his ears. 
Why had he even offered that?? 

Uncomfortable silence was filling the room while shameful heat was radiating from both of their faces. 
In the end it was Senku who was the first one to speak again, erection still throbbing painfully between his legs. 

“Do you ...”, he sounded breathless, when his gaze landed on Gen’s still blushed face, “... want that?”  

Gen took a deep breath and swallowed heavily, not meeting Senku’s eyes yet, before he answered.  
“To ... help you ...?” 

There was another pause in which the mentalist finally looked up. 
“It’s causing you pain ... yes, I want to ... help you release the pressure.” 
 
Did it help to keep his speech rather clinical, like Gen had with his touches before? A bit. But it wasn’t enough for the blush to fully leave his cheeks, while he waited for Senku to respond. 

Another pause followed in which Gen nervously licked over his dry lips. He still felt too hot, while blood was rushing loudly in his ears.  
When the mentalist already started thinking that he wouldn’t get a response anymore, Senku’s mouth opened again.  

“Okay ...”, his voice was not louder than a whisper, unable to keep eye contact with the mentalist, while speaking.  

Gen’s eyes widened in surprise, while he was blinking a few times, trying to process that he actually had heard the scientist agreeing right now. 
His mouth opened, but then he closed it again. Senku wouldn’t have consented to his idea if he wasn’t sure. 

Hesitantly Gen reached out with the cloth again. He first wanted to quickly get rid of the remaining urine on Sekun’s skin - before he would focus on the other issue – not willing to risk a rash.  

Senku twitched and shivered at the cold touch on his erection. 
Biting his lip, he tried to stay quiet when Gen started moving the wet fabric up and down, but a muffled groan escaped him nevertheless together with a few drops of precum. 

Oh. Gen gently wiped them away as well, causing a shameful moan to break through the barrier of Senku’s lips.  

“It’s okay”, Gen assured him with red cheeks. “Don’t hold back.”  

Senku couldn’t let go though. He was too ashamed that this was even happening.  
Getting a hold of the sheets, the scientist clenched them tightly in his fist, when Gen put the cloth aside and took his dick into his bare hand. 

“Ahhh-”, Senku gasped before he could silence himself, the direct touch causing more precum to leak out of him.  

“Just breathe and try to keep as still as possible, okay?”, Gen spoke as calmly as he could.  

“Uhn h-”, Senku wanted to agree, but got interrupted by a loud, unrestricted moan. The scientist’s breath hitched and he tightly pressed his lips shut, as soon as he got aware of it.  

“It’s okay, Senku”, Gen tried to assure him once more, even though his face was glowing with a furious blush on his cheeks. The mentalist slightly shifted on his chair, before he continued.  

“Ah G-”, Senku cut himself off before he could moan his name again, pleasure flooding his senses. He didn’t even notice when his hips started moving to intensify the sensation in between his leg.  

“Oh, no Senku. Don’t move”, Gen interrupted him, and his hand stilled momentarily.  

Senku almost choked on the whine that escaped him.  

“I’m sorry, but too much movement is not good for your wounds. We don’t want them to rip open again”, Gen explained, even though Senku looked like he was moments away from screwing everything.  

“ ... h-hurts ...”, the scientist panted referring to his still throbbing erection.  

“I know. I’m going to continue, but you have to keep still.”  

Senku bit down on his lip, before he nodded.  

 
The scientist tried. He really tried, keeping his hands clenched and his face partly pressed into the pillow beneath him, while Gen’s hand was moving in a steady rhythm up and down. 
But at some point the itch was getting too much and Senku’s hips buckled into Gen’s hand. 
Before the mentalist could pull away again though, Senku managed to get hold of his hand, keeping it wrapped around his length.  

“F-Faster- ... pl-ease ...”, Senku panted, his cheeks flushed, but this time red from pleasure and arousal. Slowly the shame and embarrassment had been replaced by desire, glowing in his half-lidded eyes as well.  

“O-Okay”, Gen whispered momentarily getting lost in the Senku’s dazed, but at the same time heated, gaze. 
Senku’s hand had forced a tighter grip on his leaking dick, so Gen kept that up, while his movements were becoming faster. 

“Ahh yes- G-Gen- ...” The initial shame had been erased by pure pleasure, causing Senku to shamelessly moan out loud the mentalist’s name.  

Gen quickly licked over his dry lips, once more shifting in his position, while he was keeping the pace up, listening to Senku’s noises of pleasure he was bringing out of him.  

Senku’s hand clenched around Gen’s on his erection and he leaked again. The wetness made it only easier to keep the up and down movement smooth and Gen caught himself becoming even faster.  

“G-en ahhh- yes-”, Senku repeated breathlessly. It took all remaining strength in him to keep his hips in place to do as he had been told to not agitate his still healing wounds.  
It was hard. Especially with the medication - as well as the ecstasy of the moment - not leaving much of the pain over to feel right now. 
He had let go of Gen’s hand again - signalizing that the other man was apparently doing a good job – and was clenching the sheets tightly. 

Keeping his gaze on Senku, Gen listened to him panting incomprehensible words in-between repeating his name. He was obvious getting close.  

“NNhhggg-”, Senku groaned, sweat glittering on his flushed face, while pleasure was threatening to swallow him whole. Heat was coiling deeply inside his lower abdomen, building up a certain pressure that felt like it would spill over any second.  

“Ahh- G-Gen- I-”, Senku gasped, eyes squeezing shut, when he threw his head back as much as his sideways lying position allowed it. “ ... -I’m g-going t-”  

“I-It’s okay Senku.” Gen had become breathless as well, thankfully Senku didn’t seem to be aware of that though, “ ... let go ...”  

And that’s what the scientist did. With his eyes squinted shut and a grip around the sheets that was turning his knuckles slightly white, he let the heat spill out of him.  

Senku was coming over Gen’s hand. At least that’s what the mentalist thought at first, until he got aware of the rather thin consistency of the liquid that was splashing out of Senku’s tip. 
Gen’s eye widened at the realization, and he quickly aimed the scientist’s dick down to the soiled towels on the floor, before anything could get on the sheets. 
Senku was ... having another accident?! 

Gen’s eyes quickly flickered up to Senku’s face, while he instinctively kept the pace of his hand up. 
The scientist was moaning and groaning, while his body was slightly convulsing with pleasure, seemingly completely unaware of what was happening. So Gen didn’t say anything.  
He just watched how more pee was leaving him and splashing onto the towels to his feet. 

“Ah- ahhhh G- aah!” It felt like he kept coming and coming, but it could also just be the drug making it feel like that, Senku thought. And in the end the scientist didn’t really care. It felt too good when the pressure was eventually released.  

With the scream Senku was finally actually cuming. Gen watched the long sticky threads of white, spilling out of his tip before they started covering the already soaked towels.  

“Haa- haa-”, Senku panted, his chest heaving to such an extent Gen got worried about his wounds for a moment. But thankfully the bandages stayed mostly white, while the scientist was slowly coming down from his high.  

Gen’s hand slowed down as well, but kept hold of Senku’s softening dick, when another trickle of pee followed. 
Okay, he really had to talk with Francois about that juice. This amount in such a short period of time wasn’t normal, was it? Just what had the butler put in those drinks?? 

With the stream finally dying down, also Senku’s breathing calmed down again until it was no longer more than quiet pants from the exhaustion to keep breathing with a still healing lung.  

 
“Are you ... feeling better now?”, Gen eventually asked with a glowing blush on his face. He had once more taken the cloth and had wiped Senku’s crotch area until it was clean. 
Taking the blanket, since they actually had run out of fresh towels, Gen first dried him off, before he also padded down his face to help with the sweat there. 

Already expecting to not get an answer anymore, since Senku had fallen asleep, Gen was surprised to hear a quiet hum coming from the scientist, after he had covered him with the blanket again.  

Senku was finally completely relaxing, and Gen was just glad that he hadn’t opened his eyes again – before fully falling asleep - and seen in which state the mentalist actually was after helping him out.  
He quietly shifted on the chair, shamefully aware of the tightness that had built up in his pants especially over the last minutes. But that was something for a different time. Gen wouldn’t even start to unwrap this right now.

Instead, he decided it would be more than wise to let Francois bring some more towels, so Gen could also put one over Senku’s crotch again – and have some extra material in reserve. Just to be on the safe side.  
The mentalist would also take this opportunity to ask the butler what the hell they had used for those fruit drinks to have this kind of over excessive effect on Senku’s kidney function??  

Series this work belongs to: