Linky's Fics

Mission: Go To Sleep

Fandom: Kamen Rider Zeztz

Character(s) and/or Pairing(s): Tetsuya/Baku, Zero Is Here For A Little Bit

Rating: E

Word Count: 2261

Contents: Literal Sleeping Together (That Becomes Sexual), PWP, Cock Warming, Sleepy Sex, Anal Fingering, Anal Sex, Older Man/Younger Man

Notes: There's a bit where it's implied Tetsuya is using spit as lube, but you can also read it as him somehow having lube on hand. Massive thank you to Adri for the idea that inspired this! Also done for the All Ships Ship Week prompt of "literal sleeping together". Originally posted on 2025-10-21.

Summary: Baku was having trouble sleeping.

Also On: Ao3, Dreamwidth


Baku was having trouble sleeping. This wasn’t good.

Normally he could go out like a light on command, a skill many folks his age and older envied. This only proved more useful once he became Agent Seven. To complete his missions he had to get into his dreams fast, time was of the essence after all.

So the fact he was having this problem… It could prove dangerous to his mission, and fast, if not taken care of.

Visibly Baku look troubled while pacing around the base. He then glanced over to Zero who was pouring himself bike fuel. “Commander Zero? What do I even do about this?” He whined.

Slowly and coolly walking up the stairs to his desk, “Yes… This could interfere with your mission.” He sat down, looking down at Baku. “For starters, how about sleeping with another person. For some this helps them.”

EH?!” Baku jumped, eyes almost bulging out of his head. His boss saying such a thing so casually…

Taking a deep breath, he then gulped. “C-Commander you don’t mean—”

“Agent Seven, I am being quite literal with my proposal. Get your mind out of the gutter.” Sipping his fuel, his voice still so cool and casual. “Though I will not judge what activities you choose to do in your spare time.”

The gears began to turn in his head. “So, I share my bed with someone else?”

“Precisely. The warmth of another body might help you drift off into sleep.” Finishing his cup, Zero got out of his seat. “This is just one way to go about it. Give it a try. Either way, it is imperative that you find a solution as soon as possible.”

“Yes commander!”

It was a plan, though still a strange idea to bring up. However he could see the logic in how it could possibly work.

Who could he share his bed with was the question…


Baku pondered while sitting down in his room. The cool breeze through the window rolling in. Deep in thought as to who could he share his bed with. Though he wondered if that could physically be done… It might be a bit of a tight fit.

Before he could continue to think on it, Fujimi-san rolled in through his window. He expected Nagumo-san to follow suit, but after some moments of silence there was nothing.

It looked to be only him this time.

“Fujimi-san… Where’s Nagumo-san?” Baku was starting to get used to these two jumping through his window at random times. Though he still wasn’t a fan of it happening in the first place.

“Nasuka is busy at the police station. She told me to go ahead to your closet by myself.” He clumsily got up, stretching out his back. “Still need to get things set up in there.” It doesn’t take long for him to notice how troubled Baku looks.

“Hey. What’s wrong Baku?”

Baku sighs, glancing to the floor. “I’ve been having issues with sleeping. If this keeps up, it’ll get in the way of fighting Nightmares.” He directs his gaze to Fujimi. “My boss told me to try sleeping next to another person to feel their warmth… But I don’t know who I can even ask that! It’s such a strange thing to request—”

“I’ll do it!” Fujimi-san interrupted him, grasping his shoulders. “If its for the sake of fighting the Nightmares, I’ll do whatever it takes.” Grinning with a fire now blazing in his eyes.

He’s serious about this.

Baku silently blinked. A bit taken aback by such a fast and sure response. He was grateful to have figured that part of the plan out, but Fujimi-san was strangely quite eager about the whole thing.

Well, in a conundrum like this he couldn’t be picky. The Nightmares had to be defeated. And the only way he could do it was to go into the world of dreams. If he was unable to sleep, the world could fall into ruin again. Potentially forever this time.

“Alright. Let’s give it a try at nighttime.”


Moving all those boxes around in the closet sure was a workout. Nagumo-san never ended up arriving, still busy with other tasks. Whenever she would come back, the office for both her and Fujimi-san was ready now.

Doing all that physical activity was also a good way to make him more tired. Baku certainly felt a little sore, but if it would translate into being able to sleep would have to be seen.

Thankfully, Fujimi-san was able to fit onto the bed with him. After some fiddling around the pair found it most comfortable to be spooning. Fujimi-san being the big spoon, Baku the little one. It looked to be a good way to transfer body heat too.

Never in a million years did Baku ever expect to be doing this with a man. An older man no less. Fujimi-san was handsome, and Baku was open to the prospect of being close with other men if he ever felt such a way…

Regardless, absolutely none of this was on his bingo card. It felt quite nice though.

Feeling the warmth of another human up against him in a bed was even more pleasant than he expected. Glancing over, from the look of it Fujimi-san was enjoying himself as well.

A beat of silence, and Baku felt something begin to rub up against his ass.

Perhaps Fujimi-san was enjoying himself a little too much.

“Uh… Fujimi-san??” Baku whispered, heat rushing to his cheeks. As he opened his mouth to continue, he had no idea what to say next. While boners could happen at random, and they did for him—this began to raise some questions for Baku.

Did he actually like him? Or was his body acting all on its own?

He wouldn’t object to a hot older man being into him… But this was so sudden, they only met recently, and this was also not the time for anyone to be having any boners.

So many questions were being raised, and Baku had no answers.

“I am not controlling this! Seriously!” Fujimi-san started to inch back away from him, the cold air suddenly striking Baku as his heat moved away. This only made him feel more awake.

Despite the awkwardness of it all, they’d have to press on. He needed to fall asleep at all costs, even if it meant feeling another man’s bulge in the process.

Baku also began to feel something indescribable in his gut at the thought of Fujimi-san being into him… Man, now was not the time to be learning new things about himself!

Suddenly he had an idea. It made him feel like a bit of a pervert, but it could work.

“Don’t worry about it.” Baku reaches behind him and grabs Fujimi-san’s arm. “I’m going to need you to put your dick in my ass.” Sounding as cool and serious as he can, like how Agent Seven would. But internally he feels even more like a pervert saying this aloud!

“W-What?!” Fujimi-san’s eyes widen and he freezes in his tracks. “This is so sudden! What’s gotten into you… I thought this wasn’t supposed to be that kind of sleeping together!”

Baku turns around to look at him straight on, still looking as serious as he can despite his growing embarrassment. “Think about it. It will only increase the spread of body heat, making it easier for me to fall asleep.”

The two look at each other for a few moments in total silence. Baku can see Fujimi-san walking through all the steps in his head, carefully contemplating everything.

“…Alright. It’s for the sake of defeating the Nightmares.” He unzips his pants, freeing his cock. “Turn over and get ready.” He’s just as serious as Baku is.

He does so and expects Fujimi-san to enter him. Instead he’s greeted with wet fingers entering his hole.

“F-Fujimi-san?” Baku’s body starts to tremble and he can’t control it. Goosebumps forming all over his skin.

“You need to be loosened up a bit first. Don’t wanna hurt you.” Hand on Baku’s hip, Fujimi-san is concentrated on the task at hand.

Baku arches his back, letting out a gasp. Immediately covering his mouth right after to make sure his sister doesn’t hear him. The absolute last thing he needs right now is for that to happen.

It feels so damn good too, Baku bites his lip while continuing to cover his mouth with his hands. Muffled whimpers fill the air of his room as Fujimi-san spreads him open. One finger, then two, then three. This is the first time he’s ever had anything enter him before, and a new world has begun to show itself.

He really is learning too much about himself tonight.

Baku can’t help but wonder what exactly Fujimi-san is thinking throughout all this. Is he enjoying himself too, or is this strictly yet another mission for him? With how much he touches other men unprompted, Baku isn’t quite sure.

“Alright. I’m coming in now.” Fujimi-san whispers.

Baku whines as the fingers leave him, making him feel cold and empty inside. But before he knows it Fujimi-san’s dick enters him, slowly. He arches his back again. Leaning into Fujimi-san as he whimpers and gasps.

This feels even better than fingers.

He feels so warm and comfortable inside and out. Not to mention a fulfilling sense of fullness from Fujimi-san’s cock being deep inside him. As his arms wrap around him from behind, that feeling of warmth only grows stronger.

“Does it feel good?” Fujimi-san whispers again. There’s a sense of tenderness to his voice that stirs something in Baku’s heart.

“Mm. Yes.” Baku says, as coherently as he can anyways. Trying to remember a time in the past where he had felt this good before. This moment was truly unlike anything else. It’s the best he’s felt in ages.

“Good.” Fujimi-san sounds as equally pleased. Baku swears he can hear Fujimi-san let out a small gasp too.

He tilts a little to get a better look at him. And in the corner of his eye he sees Fujimi-san having a dreamy expression all across his face. Looking as if he is in a state of utter and pure bliss. Out of the short time they’ve known each other, he’s never seen him look so relaxed.

This sight stirs Baku’s heart even more than before.

In comfortable silence, Baku enjoys and savors the all-encompassing warmth Fujimi-san is providing him. Knowing that Fujimi-san is enjoying himself too makes him feel even hotter.

Baku feels himself quiver from that thought, and the stimulation makes Fujimi-san moan.

“Fujimi-san…” Baku sighs. He gradually feels his eyes starting to get heavy. But he’s still awake enough to notice a burning sensation deep in his core. Shifting his hips, he moans as Fujimi-san whimpers behind him.

It feels good being filled, but he craves something a little more too.

Fujimi-san seems to have the same idea, grabbing Baku’s hip again and slowly rocking in and out. Careful enough with his movements to not be too loud. Though the room is still filled with the sound of skin hitting skin.

Baku feels Fujimi-san press his lips into his neck, softly kissing and nipping at his neck. His stubble grazing against his skin too, it all feels wonderful.

All Baku can think about is being fucked and filled. This is his first time having sex, and he can’t get enough. His body feels so comfortably warm, and combined with the physical activity he can feel his eyes begin to become heavy.

“F-Feels… So good…” Baku gasps in-between soft moans. “More Fujimi-san…”

He promptly follows Baku’s word, and speeds up his thrusts. His dick now rubbing against his prostate, and Baku’s body is hit by wave after wave of pleasure. Fujimi-san keeps whimpering as he feels Baku tighten up on him.

“B-Baku—” He gasps before his hips start to shudder, and Baku feels him fill him up inside. Making him feel even more warm and satisfied as Fujimi-san’s cum fills him.

Fujimi-san unzips Baku’s pants, jerking him off so he can come too. It doesn’t take long for Baku to do so after everything they just did. Especially with the nice warmth of Fujimi-san’s hands on his dick.

Everything feels incredible, and Baku is on cloud nine. It’s easy to assume Fujimi-san feels the same.

His eyes get even heavier and before he knows it he’s fast asleep. Entering the world of dreams once again.

The last thought he has before he truly falls asleep is to do this again sometime in the future.


Baku’s eyes suddenly open up. As he looks down, his driver is attached to his chest. His spy phone also in one hand, Zeztz sensor in the other.

Alright! Everything worked! Zero’s plan, despite being a rather strange suggestion, actually did the trick!

Fujimi-san’s dick is also still right in his ass.

The detective is absolutely out cold. And that same dreamy smile from last night still on his face as Baku tilts to get a look at him. He still feels so warm and comfortable across every centimeter of his body. Fujimi-san still feels so wonderful deep inside him. Especially as the cold autumn morning air wafts in through the window.

Minami is already out of the house at this time, so he doesn’t need to worry about her coming in suddenly… Perhaps he can stay here like this for a few more minutes until he needs to wake him up.

Or maybe a bit longer.


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