okay so idk what to write about this is awkward but i know that i need to get a genosai lemon out of my system so i'm just gonna write this and see what happens k got some merlot and a peach and some adam lambert this is gonna be good

i haven't finished the manga, i'm working on it, i'm going to rely on some information that may or may not be accurate that i've read in other genosai fics so please forgive me

A/N: bahahaha look what happened! ^ welcome to this fanfic, please enjoy!

...

It started out as a quest for true, destructive power. That was all. He was the most powerful human- no, living being, I had ever seen. Not only that, but he saved my life. Hell, I was on the verge of suicide. My body, all of Dr. Kuseno's work, my quest to stop the Mad Cyborg, all of it would have been killed along with my brain - because of that damned mosquito girl. But he, in the nick of time, took her out. Not only that, but he did it with a smile on his face. Here I was, in all my anger, fighting ruthlessly, fighting foolishly. And this- this man, seeming so ordinary save for the rippling, hard muscles that adorned his smooth body, showed himself to be capable of more power than even my own self-destruction could produce.

These thoughts never left me for quite some time. But something else began to settle in a few weeks after I moved into his house.

At first I was happy just sleeping next to him on the only (tiny) piece of floor that could fit either of us in his apartment. Even being close to him, I thought, would help me. As ridiculous as it sounds, perhaps his power would radiate onto me. Perhaps I could find out more about his power by studying his every move. And I was ecstatic just talking to him, encouraging him, helping him with his daily chores. I felt I was forever indebted to this great man, and I was happy with that.

Somewhere in the back of my mind I was aware that my attachment to this man was peculiar, as I had never been so addicted to someone as I was with him. But I ignored that and kept going, convinced that I was simply on the search for power.

But things change. I started to get little sparks of feeling, unlike anything else. Mixes of nervousness, happiness, excitement...when Saitama-sensei crossed my mind or my line of vision. When he spoke, when he fought, when he got up in the morning and stretched. Looking back I knew that Dr. Kuseno had equipped me with everything I would need to lead a normal(ish) teenage life, and that included...hormones. Of course I had my original brain, but Kuseno also created networks throughout my midsection to ensure that my hormones could communicate properly. Apart from exhibiting intense teenage anger and impulsiveness, recklessness...I wasn't really affected. Until the past few days. Until this started happening. I can feel my core burn at the most random times now, not because of anger but because of whatever Saitama does to me. Sometimes my body starts to glow without my command, and I can feel the steam puffing out from my shoulders.

The times when his gloved hands would land on my body were primarily in times of battle, times where I was too focused on destroying, destroying, destroying to care much about a little human contact. But...it was soon after I began to be affected by my...hormones. He was preparing dinner, insisting that I rest since I had just returned from a big repair. I knew I didn't need the rest, but he was surprisingly persistent. Just the simple fact that he was showing care towards me, a pathetic hero compared to the likes of him, made my metal heart glow and flutter. I stole another glance at him as he made dinner, his body covered only with some short boxers and a blue apron. He filled two dishes with food and untied the apron, hanging it up. I felt my body start to heat up admiring his chiseled torso and tried to look away as he began walking towards the table, muscles rippling. Damnit! This didn't affect me previously! Hell, he was naked the first time I met him! We've even taken steam baths together before! But it was all normal then, my one-track mind caring nothing about how psychically beautiful Saitama-sensei was. Things had certainly changed.

Saitama plonked two bowls of noodles on the table, and was about to go to his usual place before he stopped and turned towards me suddenly.

"Whoa, buddy, you okay? That isn't coming from the food, is it?" Saitama questioned with mild concern. My mind jolted, eyes widening the slightest bit. I averted my eyes to my shoulders, where steam was lightly puffing out. I internally panicked, trying to come up with some logical excuse. I was about to start explaining when Saitama reached out to feel the warm vapor on his bare hands. "Wow. This is the first time you've done this outside of battle."

"I apologize, Sensei. The weather has been quite warm lately. Sometimes even the slightest overheating can be dangerous for my brain, so my body will always take steps to maintain a stable temperature." That was close to a lie. It was the end of spring, the weather nice but in no way hot. I wasn't one to fib but I wasn't about to admit anything involving my hormones either. Then Saitama laid a hand directly on my shoulder.

"Wow, so warm!" He marveled.

I started to steam even more. Such a small, friendly touch shouldn't mean anything but to me it meant everything. I wanted to touch him, I wanted to hold his soft hand, I wanted him to feel the parts of me that were soft as well...

"Hey, I was thinking about taking a hot bath later. Think you could help me out?" Saitama cut in. Oh no. Now the steam was coming off in billows, and my arms were glowing orange as my mind went to the worst places. Logic thrown out the window. What...did Sensei mean by that? Could it be that...

"You know, since the water in this place doesn't really ever get as hot as I would like it to." Saitama finished. Oh. God. That's what he meant.

"Of course, Sensei." I replied quickly, my core seemingly twisting around. Saitama smiled, going back to his spot and settling in.

"Let's eat!" He was about to take the first bite, when he looked straight in front of him. I could feel his eyes burning on me as I covered my mouth, gaze averted and shoulders tense. Saitama looked up. Vapor was flooding the ceiling and slowly filling the entire room. "Dude, you..."

"Yes, let's eat, Sensei!" I turned back quickly, wincing as more steam emitted from my mouth. I ate the noodles at a rapid pace, refusing to look at Saitama again. He stared dumbfounded for a moment, but shrugged and ate his food as well.

When Sensei was finished he stood up wordlessly and put his dish away, going to the bathroom to run some water. I sighed out some more fog in relief, glad to have a moment to myself. The room had cleared up, luckily. I got up and put my dish away, quickly washing mine and Sensei's before I was called by him. When I walked into the bathroom, he was already in the water, fully exposed. Ugh. The biggest problem here was that since I would be taking a bath with Sensei, I wouldn't have a valid excuse to come back and get rid of this persistent feeling...

"What are you looking at? Get in here!" Saitama said lightheartedly, and I braced myself. I guess I couldn't refuse. At least I had an excuse to heat up. I sat down across from my master and relaxed, letting my body start to glow on its own.

"Oh yeah, that's more like it." Saitama mused, closing his eyes. I took the opportunity to take in the sight of the beautiful man before me, toned pecs far superior to my mere chest plate, and soft neck with his clavicle stuck out against his skin enticingly. When Saitama opened his eyes again my gaze was fully torn from him, but a pained smile was on my face.

"Hey, dude, you're usually really talkative." Saitama pointed out.

"Sorry, Sensei! Today I have chosen to take on a more observational approach rather than an interrogation-based one." I blurted out, cringing at what I just said. Seriously? I couldn't be more obvious. That just sounded creepy.

"Oh." Saitama replied simply. "...Okay." The water suddenly rose ten degrees Fahrenheit. Thank Kuseno I wasn't really naked before my Sensei.

...

We both got out of the bath, Saitama apparently feeling very satisfied and sleepy while I felt much, much worse than before.

"Well, I'm gonna get to bed, Genos." Saitama hummed, getting out his futon and laying it out.

"I will do so as well, Sensei!" I replied assuredly, following suit. "Good night." I crawled under my blanket and laid there motionless, waiting to hear the soft snoring of the man beside me. This was torturous, as my mind continued to cycle through imagining lewd situations and there was no way to stop it. Finally I was sure that Sensei was asleep, and I turned to face him. His body was turned, slowly rising and falling. With extreme care, I reached out to stroke the top of his smooth head, and trailed a finger down to the back of his neck. Tentatively, I leaned forward and pressed my face close to his soft skin, almost landing a kiss on his nape when I heard a small noise and I rolled back to my futon, too scared to continue. I looked up to see trails of steam floating towards the ceiling. This was too much to take.

I quietly slipped out of the living room and shut the door of the bathroom behind me. Settling into the bathtub Sensei and I had just been in, I unlocked my panels and reached down, desperate for some kind of release. I imagined Sensei as he had been, right there...beautiful and peaceful, yet so erotic in the way his gorgeous body flexed and unflexed as he sighed in pleasure at the bath containing warmth I had been responsible for.

I pulled out my length and tested my grip, fascinated at this black organ I hadn't taken interest in until recently. Relaxing, I lightly stroked my dick for the first time since...since when? I couldn't remember the last time I had gotten worked up like this...all I knew was that my genitals were perfectly functioning as I remember them when I was still human. Though my position in the bath was uncomfortable, the feeling of being touched after holding back for so long was overwhelming and I blocked out everything else.

...

Something woke me up. What, a monster? I heard a lewd moan coming from somewhere. Huh? There's prostitutes all the way out here? Though, that voice sounded strangely familiar. I turned over. Oh.

"Genos?" I muttered sleepily. Another moan rang out, coming from...the bathroom?! What the hell?

...

I was getting close, and trying hard to suppress any noises I was making but honestly too turned on to care. Saitama...Saitama-sensei...don't say it...don't say his name out loud...shh...

Suddenly the door opened. Shit! An enemy? I whipped my head to look at the intruder. What if he hurt Sensei-

Oh.

It was Sensei.

Oh no. Nonononononononono.

What do I do? What do I do?!

I closed my panels, but it was too late. Was it?! I howled at the pain as my swollen dick was suffocated by hard metal. Damnit. Then Sensei turned on the lights.

"Genos?" He mumbled, rubbing at his eyes. "What are you doing?" My mind rushed for an excuse. Uhhh...uhh...

"I heard you making some pretty weird noises. Why did you scream just now?"

Oh god, it was a scream?

"Oh, and you're doing the steaming thing again. And you're all glowy?" Sensei observed lazily.

"I-" I started, but Sensei's eyes shot open in realization. I panicked again.

"Oh, I see!" He said excitedly, bumping a fist down into his palm. "You're initiating a routine to ensure that your mechanics will work properly tomorrow!" I nearly deadpanned at the stupid response, but felt a bit of relief. Maybe he wouldn't find out?

He smiled smugly, but then tilted his head in further confusion.

"Wait, that makes no sense. Why would you have to do that in the tub?" Sensei retracted, brow furrowed. I opened my mouth to explain.

"You see, Sensei-" and just as I was ready to spout some technical bullshit Sensei wouldn't understand, my panel opened. Forgetting what was going on, I produced a drawn-out, breathy moan at the blissful feeling of release.

Ah! Sensei was standing right there! I curled up my knees in self-consciousness and tried to ignore my leaking, needy dick. Sensei stared at me in awe.

"Wait, Genos, you..."

My only response was billows of steam much bigger than any other I had made so far today. A loud beeping began from my core, and I suddenly lost energy, slumping against the walls of the tub.

"...water..." I mumbled.

"Water?!" Saitama exclaimed. "You're in a bathtub!" Deciding to ignore this, he ran to the kitchen and filled a glass of water, bringing it back quickly. I took the glass and downed it, the beeping stopping and my energy coming back. I caught a short glimpse of Sensei's face, which was noticeably red. Quickly I whipped back around and stared straight ahead of me. Fuck.

...

What the hell was happening?

"Okay, Genos..." I started. "So...you..." I scratched my cheek, thoroughly befuddled and hoping Genos would hurry up and explain so I wouldn't have to ask the dreaded question. But it was all starting to add up. The real reason why Genos gets all...steamy...could it just be that he's turned on? I could feel my blood rush south at the thought, despite how weird it was. Just...the fact that Genos had a dick under all that...was fascinating. After several moments of silence, I couldn't take the tension in the room.

"U-uh...sorry to bother you!" I ran away from the situation, simply leaving the room. You can't one punch awkward.

"Wait, Sensei!" Genos cried out. I paused in my speed-walk, but didn't particularly want to respond.

Ah, hell. What was I supposed to do, go back to sleep?

I returned to Genos, fixing him with a stunned look.

"I'm sorry, Sensei, I know this is probably a shock to you, I apologize for not saying anything earlier but I didn't find a need to say anything because you never asked and I know this looks bad and I regret my actions but know that I am offering you my sincerest apologies and-"

"Wait, wait, stop!" I yelled in agitation. "Does this mean...I've been bathing in cyborg jizz?" Genos stared back at me blankly. He was still covering his crotch area, but I had caught a good look of a real(ish) dick before when he had let his guard down, a dick secreting some kind of substance.

"Cyborg...jizz, sensei?" Genos said. "If you are asking what I think you are, then I will let you know that the substance that my body produces, while not biological, is perfectly sterile and sanitary and so you would have nothing to worry about if you did bathe in it accidentally but I can assure you that I would clean up after myself and furthermore this is the first time I have done this so I can say with confidence that you have never bathed in my "jizz" before and-"

"Okay!" I stopped him. "So this is the first time you've done this? What does that mean? In my house, or just in general?"

"W-well..." Genos started again. "As far as I remember, this is the first time I've done...this since I've become a cyborg." Wow. Is he being serious? That's actually pretty impressive. Any other 15-19 year old boy wouldn't have been able to achieve that. Then again I guess he was hit by a pretty big tragedy.

"Okay, dude, but still. It's not really polite to just move into someone's house and then go jack off in their bathtub, you know?" I pointed out. Genos looked crestfallen. Oops, had that come out harsher than I intended? Well, the kid did need to understand-

"I-I'm so sorry Sensei...I know I'm disgusting, I'm sorry that I've repulsed you so and I will leave the house immediately if that is what you desire." Genos spurted out, head down in shame. Oh, crap. I could hear a dripping sound, and that wasn't from Genos' dick.

"Genos, look at me." I said in my serious voice.

The cyborg raised his head tentatively, thick tears dripping down his face.

"No, no! Don't cry!" I sighed. Damnit.

"Sensei, please, I'll leave right now and-"

"No! It's okay! Just calm down, okay?" I said, agitated. "Just look at me!" Genos' shiny, golden orbs shyly met mine and I knelt down on one knee, in full seriousness mode.

"You said this was the first time you've done this since you've become a cyborg, right? So why are you doing this tonight?" I questioned. Genos looked like he didn't want to answer that.

I couldn't blame him.

"Okay, so why were you steaming so much today?" I felt kind of creepy asking this, but I needed to get it out of him. I felt like some kind of weird Freudian therapist, a psychoanalyst asking about peoples' sexual health. The answer to why he was steaming should be obvious, but whatever. I'll fix this.

"U-uh...Sensei...I'm sorry, I guess I was getting a lot of...urges today." Genos replied quietly. Okay, obviously. So how does one deal with a cyborg in heat? I had no idea.

"Were you not getting these urges before, then?" God, this is weird. But I had to know why this began all of a sudden.

"Well...I only started getting them quite recently, maybe a few days back..." Okay. So they didn't start literally right when he moved in, then. Maybe that was good? I would let him off the hook for now.

"So, but...you have a dick." I mean, I still had to get an answer for this one. I had to try not to laugh when I said it, but Genos still looked depressing so I stayed serious.

"Yes, Sensei. I have fully functional sexual organs, they're just incapable of reproducing." Genos answered. Okay, well that settles that. Actually I had one more question but I figured I should stop interrogating him for now.

"Alright, Genos. Listen." I said gently, eyes fixed on the sad cyborg before me. "This is okay." Genos looked suddenly hopeful. I tried not to roll my eyes.

"What I'm trying to say is, I was a teenager once. I understand that urges are hard to repress. So I'm not going to be mad at you for, uh...doing this in my bath tub." I told him. His eyes lit up a little bit. "But, please...find a better place to do this, okay?" I stood up and walked out of the room, shutting the door behind me. Okay. I had escaped. Tomorrow's me will have to deal with this further. Hopefully Genos got the message and will clean up after himself if he does come after this. Damnit. That also turned me on a little bit. Thank god I'm wearing really loose boxers. Shut up. Of course, since Genos was a cyborg this whole thing wasn't as gross as it could be. If I found some random 19-year-old jacking off in my tub I would probably vomit. But, it was just Genos.

Just Genos? What the hell did that mean? I don't know. But anyway, I understood him. I also haven't felt any urges in a long time. But I would never admit to him that I felt a blink of them tonight.

...

My right arm flopped over the side of the tub in relief. That was terrifying. Mortifying. My master, my beautiful master, walking in on me at the very worst time, and I couldn't even control myself. I thought it was all over. I thought I would have to leave this person, this man who I admire so much, who I...I'm definitely liking somehow even more than I anticipated.

What a kind soul. What other person, when coming across a monstrosity like this, would have the heart to forgive such a lewd crime? From now on I vowed to control myself. But...that would be difficult. I will just have to see what happens next. If I end up steaming in front of Sensei when I'm not in battle, he will know what's wrong, which will be quite humiliating. But it's just something I'll have to deal with.

I looked down at my spent dick, now unwilling to orgasm. My panels closed easily. A storm of unresolved desire welled within me but Sensei's show of kindness overpowered it.

For the moment I was okay.

But the more I thought about what happened, the more I saw demons rearing their ugly heads. The way Sensei responded...as to a child. Could be forgiven. I was crying like a child, after all. Was he disgusted? Not to the extent that a person should be. Rather, he was more surprised than anything. He didn't think it was possible for me to have sexual desire, and didn't think that I had sexual organs because they are always hidden from the outside eye.

Right now it would be fine.

...

lol sorry that was not a lemon ok i need a setup i can't just go straight into it like a freaking makoharu fanfiction it's kind of like my l and light one there just needs to be a little bit of time k i got this there will be a lemon very soon thank you have a nice day