an infinity train book 3 fanfic ; omo and tickles.
Fandom: Infinity Train (Book 3 - Cult of the Conductor)
Published: November 7th, 2022 - Ao3
Word Count: 2,249
Content Warnings: bedwetting, omorashi, sex
i couldnt find any fics about simon launrent being tickled or pissing himself so i did it myself. slightly edited April 10th, 2025 because some parts made me cringe super hard.
It was another day with The Apex, as everyone was prepping for bed. Simon was deep in his study, working on his mini figures for his diorama. Grace was busy orchestrating the biggest sleepover The Apex had ever had since they formed.
Things were going fine. The kids were respecting Simon’s space, and so was Grace. He was never too big about sleepovers unless they were specifically with Grace. Because of this, Grace promised she’d be sleeping with him instead of with the army of children that lined the floors of the Mall Car.
“You don’t have to, you know.” Simon had tried to reassure Grace. “You can sleep with the kids. I’m sure they’ll like that better than me keeping you to myself.”
“Oh come on, Si. They’ll survive without me. We haven’t shared a bed since we were The Apex’s ages. Areyou scared you’ll get morning wood next to me? I won't judge you for it.” Grace teased, poking him in the cheek.
“No! It’s not that. Christ, Grace.” Simon blushed hard, placing a hand over his face. That was the least of his worries. What he was really worried about was wetting the both of them as they slept.
“Then what is it? You keeping something from me? Don't tell me you like to watch people when they sle-“
“Grace! I said it's nothing like that. Look, I don't care if we sleep together. Just stop making shit up.”
“Woah, my bad. Just teasing you.” Grace lifted her hands up apologetically. “We’ll, I’ll go get everyone settled for bed, and then I’ll be back. Cheer up by then maybe, okay?”
“Right…” Simon couldn’t meet her eye. He felt a little bad for getting upset but he felt weird about all of it. All he could do was sigh and go to put on his pajamas and pray to True Conductor that he wouldn’t have an accident overnight.
The two teens decided to sleep in Simon’s study on his mattress. His study gave off a relaxing vibe that Grace knew would keep Simon calm about sharing the bed with her. She was dressed in her favorite band t-shirt and shorts, while Simon simply wore his typical tank and boxers.
“I can’t believe you can still fit into those things.” Grace chuckled at the sight of his puppy dog printed boxers.
“Well, the train hasn’t fed me enough to put any weight on, so…why not? They’re so comfortable.” Simon smirked, taking a seat down on the bed. “So how are we doing this? You at the bottom and me at the top?”
Grace sat down too and placed a finger on her chin. Then she gave her friend a look.
“You don’t want to sleep side by side?”
Simon instantly began to turn red. “W-what? I mean we’d technically be either way, but I didn’t--...is it not weird to sleep like that? Like spooning? That’s…not weird?” He couldn’t fathom the concept of spooning with Grace. He’d only read about it in the romance books he found, and on the movies they’d watch.
“Not weird to me. We used to sleep together not even that long ago, so what’s the big deal now?” Grace sat back on her hands. “Unless you don’t want to.”
Simon glanced down at his feet, holding his breath. In reality, he wanted this, but his predicament would make it hard.
“I-I don’t mind.” He stuttered out, his heart racing.
“I knew you wouldn’t mind.” Grace cheesed at him before laying down on the bed lazily with her arms spread out. “Anyhow, no fair you have the cozier mattress! Mine feels like a pile of rocks.”
“I guess being resourceful has its perks.” Simon smiled, laying down beside her. “So, are you even tired?”
“Oh, hell yeah. I just spent the day entertaining those kids. It wears you out, y’know?” Grace sighed, closing her eyes. “You can shut off the lights. I’m going to sleep.”
“Oh, okay. Makes sense. Well, night Grace.” Simon got up to shut off the lights as she covered herself with a blanket.
“Night, Si.” She yawned in response before turning over.
This is where things felt awkward for Simon.
He had no idea how to return to the bed and casually sleep beside her.
Should he put his arms around her, or was that too romantic? Or just lay with his back to her? His mind began whirling as he stumbled back to the bed and climbed onto it, feeling his heart beat faster with each second.
It was easier to be a kid and not overthink things. When they shared beds as kids, Simon would hug close against Grace without a second thought. It just felt weird now that they were big kids and have gone through so many bodily changes. He was afraid of seeming too creepy or weird to Grace and ruining their friendship.
“Simon?”
“Huh?”
“You alright?” Grace was looking at him as he was in a crawling position on the bed.
“Yes. I just needed a second. Sorry.”
The girl chuckled. “You’re so weird. Goodnight.”
Simon sighed as she turned back over, giving him time to just plop down awkwardly and pull part of the blanket over his leg.
Eventually, Grace just covered up the boy with the blanket she was using so they could share, which made his face run hot once more.
Simon laid there beside Grace, staring at the ceiling for quite a while. He was too nervous to trust himself to sleep. Even though he went to the bathroom before bed, he could feel his bladder grow full all over again from his anxiety. But Grace at this point had put her arms around the boy which made moving a little difficult and awkward. He didn’t want to wake her or make it obvious that he needed to go.
He sighed to himself, blinking sleepily at the bare ceiling. All he could do was chant to himself to not fall asleep, and stay awake until morning. Which would be until a couple more agonizing hours, but it was better than pissing the bed and on Grace in his sleep.
“Come on, stay awake. Stay awake.” He whispered, feeling himself slowly drift off. He kept blinking hard and rubbing his eyes, but he was honestly failing. At least until Grace shifted and lifted her face to his ear.
“Why aren’t you sleeping?” She asked.
Startled, Simon winced and looked at Grace nervously. Was she not asleep this whole time, either?
“Are you scared of something?” Grace yawned. “I hope I didn’t do anything wrong.”
“No, you’re fine. It’s just…”
“You’re afraid of peeing the bed, aren't you?” Grace blinked.
Simon was speechless. He just stammered and stumbled before nodding in defeat.
“I didn’t want to wake you up.” He laughed nervously.
“You dork.” Grace sighed, poking him in the side of the head. “I had a feeling that why you were being such a baby over us sharing a bed. I’m not gonna bully you for your bed wetting problem, you know? I’ve always known you had one. Like, who else does laundry almost every other night other night and has a waterproof sheet on their bed? I’m not stupid.”
“A-ah…right.” Simon blushed hard.
“You’re bad at hiding things. But it’s okay. I think its kinda cute, to be honest. Like if I do this-” Grace ran her fingers underneath his tank near his belly. “Does that make you have to go?”
Simon felt a zap surge through his body and bladder at her touch, sputtering into a weak laughter. “Oh God, Grace don’t do this to me.”
“You’re still ticklish! Oh my God, how cute. How about this?” She then applied a bit of pressure from the top of her fingertips near his belly button.
Simon's breath hitched as he felt a small spurt of pee leak from his penis, making his hands shoot down to his crotch. A small wet spot began to grow at the front of his boxers. “Grace!”
“I’m sorry, this is so cute. I’ve always wanted to do this. Do you actually mind me doing this? Or do you like it?”
“A-Ah…” He wasn’t sure how to respond. He wasn’t exactly opposed to it, but he felt so embarrassed over almost peeing just now.
“I can stop.”
“No, don’t. I…like it.” Simon sputtered out. It was true, he did like it. Like, a lot. It made him feel fuzzy in the head.
Grace smiled, placing her head in the crook of his neck before going back to ticking his sides. “You like this then, huh? The teasing?”
“Ah, hahaha. Grace, oh gosh. AHAHHAHA, ohhh.” Simon squirmed and giggled, feeling his body grow increasingly hot and bothered. His bladder was begging to be let loose, but he held it in the best he could. Grace’s hands were traveling all across his body, up to his chest and close toward his dick. She even let one hand slip down into his boxers and wrap around his hardening, leaking shaft.
“SiSi, you’re so adorable. You’re getting hard over nearly peeing yourself.”
“I-I can’t help it, hahaha.” He laughed hysterically as Grace began to jack him off and tickle his side more. “Ah, Grace. I can’t hold it.”
“Let it go, then.”
“I-haha-I’m trying to not let go.”
“Let me help you.” She kissed his neck before bringing her hands around his waist to apply heavy pressure on his bladder. The weight of her palms were enough to break the dam.
Simon's eyes went wide as he cried out, his boxers becoming increasingly wet as his stream of pee strengthened with each second that Grace pressed on his bladder. A puddle formed under the two of them, sloshing as Simon squirmed.
“You really were holding it in, huh?” Grace mused, kissing his ear.
“Ahaha, sorry.” Simon chucked, feeling weird to be laying in his pee with Grace. It wasn't that it was anything new to him, but it was the fact that everything that just happened actually…happened. His mind was whirling, and so was his heart. He had no idea how to feel about it, but if anything it did feel really nice. And he didn't want it to end.
“Don't apologize. Hearing and feeling you go made me feel like I need to go now.” Grace whined, sitting up. “I have an idea.”
Simon blinked, looking at Grace as she climbed over him and practically sat on his stomach. His brain could barely handle it, growing hot and woozy.
“What are you doing?”
“Well, you peed on me, so I’m gonna have my turn now.”
Simon went bug eyed, blushing like no other. “Y-Wh-Wh…o-okay!” He blubbered out. This had to be a wet dream, literally. For Grace to prepare to pee right on his chest? It couldn't be real.
“Oh, so you are into pee stuff then.” Grace smirked.
“Whuh?” Simon came back to reality.
“Its okay, like I said it's pretty cute. I admit, I kinda like it too. Keep your eyes on me, okay?”
Simon nodded feverishly, placing his hands on Grace’s hips as she raised up lightly and moved aside the crotch of her shorts, revealing her blue panties.
Simon held his breath as he watched the fabric go from a light baby blue to navy as Grace began to piss, the hissing filling his ears. It didn't take long until her stream became strong enough to leak out of her underwear and onto his tank, drenching it. Grace let out a sigh as she released, moving the wet underwear fabric out of the way to reveal her spitting pussy. Simon’s brain was on fire at this point as he watched in awe, feeling loopy in the head as warmth covered his chest in a steady yellow stream.
In the heat of the moment, he pulled Grace closer to his face and began to lap at her stream of pee, before placing his entire mouth over her pussy.
Grace seemed just as shocked as Simon was internally, a greedy moan escaping her lips. She grinded against his face as she finished, taking hold of his ponytail as a handle.
“Oh, SiSi…” Grace whined as Simon cleaned her. “Keep licking if you want more.”
Simon obeyed and kept licking feverishly, letting Grace grind against his face. He was in heaven.
Grace's breath hitched as she came, her squirt spilling out of Simon’s mouth as he retracted back in shock.
“Oh God.” She breathed before collapsing back onto the lanky boy’s legs. Simon laid back, panting heavily as his face dripped with piss and cum.
“Holy shit.” Simon muttered out.
“Wasn't that fun?” Grace sat up and smiled at him. “Sorry to soak you like that.”
“It's fine. I liked it. I didn't think…well I hadn’t ever imagined you wanting to do anything like that with me.” Simon blushed, wiping his face with his arm.
“Hmm, well, I hadn’t really thought about it before, but you’re just so cute, I couldn’t help but mess around with you a little.” Grace gave his wet face a little kiss. “Maybe we could do this again.”
“Really?” Simon sat up, bewildered.
“Mmmhm. But right now, I think we both should take a shower. It smells pretty bad now.” Grace got up off the bed, stretching before tossing off her wet clothes. “You do the laundry while I get myself cleaned up, okay?”
Simon flushed, nodding in agreement. “Okay. No problem.”