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It was bound to happen eventually if he thought about it. Teacher was strong and the fact that he couldn't actually hurt Genos meant the cyborg was constantly asking for more. Harder, faster. Stronger.
He didn't even realize what had happened at first. Saitama had him pressed against the kitchen counter, grinding his hips against Genos' hard plated pelvis while their tongues and lips slid against eachother langoriously. Sensation for the cyborg was muted but doing this with his master was pleasurable enough even without the ability to truly reach an 'end' as some would say. A small noise caught Genos' attention when Saitama's thigh slid against his crotch. A crack, or maybe more like a pop, a small shifting of metal against metal. He didn't have much time to think about what it was when in the next moment he felt a strange, sharp jolt of sensation he'd never felt before and immediately let out an embarassing moan that started with a gasp and ended up higher pitched than he would have preferred.
He could have whimpered when Saitama pulled back to give him a somewhat wide-eyed look, one eyebrow curled in confusion. "What was that?"
Genos felt the heat creeping along his cheeks as he replied with a quiet but honest "I.. don't know." He looked down to see if there was a visible cause for the weird sensation he felt, but only managed to lock eyes on the bulge in Saitama's pants. He jerked his head up to face his teacher who was still giving him a look, but there was a hint of worry behind it now. "I think... maybe a plate slid..."
To say Genos was chagrined when Saitama immediately dropped to his knees and jerked the cyborg's pants down to his ankles would be an understatement. He sometimes felt that seeing his teacher's face down there and knowing he was only able to look at wires and metal was worse than actually having genitals examined with the same intensity. "Ah," Saitama said, sliding fingers at the joint between Genos' crotch and thigh, "there's a wire that looks a bit stripped." Fingers slid in, brushing at the wire, and Genos almost dropped to the floor. "Oh," Saitama pulled his hand back immediately, "I'm sorry, Did that hurt?"
"No." Genos responded, because while the sensation was strange it definitely wasn't painful.
"Oh.. Did it feel good?"
"... I think so," He said quietly, somewhat unsure if he could label the physical sensation as pleasure but also knowing he wasn't opposed to feeling it again.
--
In a matter of minutes Genos found himself laying, pant-less, on the table in the living room, legs spread and the top of his master's bald head bobbing beyond the curve of metal at his hips. The working excuse was Saitama needed to get a better look at the exposed wire he noticed, "just in case there's more damage." Genos though noticed that when he slid his fingers in to brush against the wire again, he wasn't watching his own hand, but Genos' flushed face.
The cyborg couldn't see his master's fingers make contact with the wire but he knew the moment it happened. The same sensation buzzed through him. Like a hum, but sharp and fast, this time dying down only for a moment then coming back again as Saitama kept his finger on the wire. Genos could feel it all over and he had a flashing memory of what it felt like to have goosebumps racing along the skin he no longer had. He could hear the buzzing in his ears, feel it on his tongue. It felt like it was even crawling across his brain. He didn't notice he was making noise until the sensation stopped and he heard his own voice replacing the buzzing in his ears with a soft keening and the whir of two of his cooling fans dying down.
"Wow." Genos looked down to see Saitama grinning at him and holding his hand up, wiggling his fingers, "That tingled."
"It did not shock you did it Master?" Genos asked, suddenly realizing the sensation must be from electricity escaping the damaged wire and bouncing from bit of metal to metal, and the one part of him that was still flesh, his brain.
"Nah," Saitama shook his head, "just felt a bit funny. It's a small wire so the voltage must be low... What about you?"
"It felt..." Genos paused, not entirely certain how to explain. "weird... but nice?"
"I see," Saitama said, eyeing the hollow the wire was in. "I think maybe I.. knocked a plate somewhat loose and it scraped against the wire and stripped some of the coating off," he muttered, sounding apologetic as he wiggled the offending metal plate and watched it slide out of place. "Shouldn't be too hard to fix though," he finished with a smile.
"Ah." Genos said, tamping down the disappointment he shouldn't be feeling at that.
"Some electrical tape around the wire should be enough of a temporary fix... Hey, can I try something first?" Saitama asked, looking equal parts hopeful and uncertain about what he seemed to want to do.
Genos' nodded, interest piqued, and watched as Saitama slid his hand into the hollow space again. This time though he pushed Genos' thigh out further, as far as the joint would allow it to pivot, and dropped his head to the space. Genos didn't have the time to even wonder what he was doing before he was suddenly seized with an amplified buzzing that danced up his body. It was sharp and soft, humming and screaming along every inch of him. He could feel the sensation racing along his brain's nerve-endings, lighting them up so brightly it even interfered with his visual monitors and all he could see was white. He came down, vision restored but mind turning so slowly to wrap itself around what had just happened. He wouldn't say it aloud but the word "orgasm" flitted its way across the small parts of his mind not still wrapped up with the vestiges of physical sensation.
He lifted his head to see his master, the strongest man he had ever met and arguably the strongest man alive, pulling back from his crotch slowly. Mouth open, tongue poking out, brows furrowed and a look of almost misery pasted across his face. "My dung ith numb." (My tongue is numb)