3rd person pov:
It was a wonderful morning. The birds were singing, the sun was shining, Saitama was snoring. What could make Genos's morning even better? Well, this can-
.
. FEW HOURS LATER
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"Hey Genos.." Saitama calls for the cyborg from across the room. Genos stops doing dishes and walks over to where Saitama sat on the floor with the controller in his hand. He was playing a fighting game online and lost right as Genos approached him.
"Damn..." He sighed and threw the controller away then sat on the couch and looked over at Genos. "Yes Sensei?" "Hey Genos, fuck me." The cyborgs face lit up and a blush rolled over his cheeks. "Really? Sensei.. you mean it? I'm allowed to have intercourse with you?" Saitama just chuckled and stood up, walking over to Genos, who was blushing like crazy and avoiding any eye contact. Saitama glazed his hand under Genos's shirt and up his torso, feeling the cold metal against his hands. Saitama has always liked Genos, and so has Genos. Saitama had never been able to confess because he was always scared that Genos would reject him and leave the house, but what made him come out to him was, "I heard you last night, Genos." Saitama says in a low voice, looking up at the red-faced cyborg.
"What? What do you mean Sensei?" He asks with confusion.
Saitama pulled Genos down eye leveled and whispered in his ear, "Ah- Saitama-sensei, suck me more, damn you feel so good~" Genos's eyes widened and steam was practically coming off of his burning face.
"Sensei.. I-" Saitama cut him off with a heated kiss. He pushes his lips onto Genos and wrapped his arms around his neck. Genos pulls away for air (which he doesn't need but he got nervous so yeah) and Saitama looks at him.
"You were jerking around thinking about me, hm?" He said with a smirk, pushing Genos against a wall, "Should I make your dreams come true?"
Genos finally gained the courage to take the lead, so he switched them to where his arm was resting against the wall behind Saitama and his other hand was on his waist. He answered with him placing his lips on the other and gently pulling Saitama closer to him. Saitama let out hums of agreement and opened his mouth to let Genos in. Genos slipped in his tongue and explored his sensei's mouth. Genos picked him up and Saitama wrapped his arms around his neck and his legs around his waist. Genos walked over to the couch, still holding Saitama and throws him down onto the cushions. He hovers over him for a moment before ripping off his shirt and slipped off Saitama's shirt then pulled off his pants.
"Saitama.. I've been waiting for this for so long. I won't hold back." Genos says, almost drooling looking Saitama up and down.
"Alright," Saitama takes off his boxers and holds up and spreads his legs so his ass is showing, "I can take you on."
"Oh god.." Genos unzips his pants and pulls his member out of his boxers. Saitama looked at him surprised, seeing as Genos's dick looked like a normal man's, that and- "Holy... Genos I take it back... that's way too.. big man.. it's scary."
"Too late sensei~" Genos grabs Saitama's thighs and slams into him, moving at a crazy, unhuman pace. "AH-hAH! G-Gen-AH! NO!" Saitama screamed out a pained filled moan and gripped Genos's shoulders, denting the metal slightly.
"Saita- Saitama ..." Genos groaned in pleasure, ramming repeatedly into Saitama, moving around and slowing his pace just for a moment.
"GENOS! RI-RIGHT THERE! Oh-AH!" Saitama was a moaning mess, all he felt were shocks of pleasure going from his tailbone and up his spine. It made him shiver, each time Genos hit his prostate. Genos quickened his pace once more, this time using all his strength and all his speed, he didn't stop for a second and Saitama lost all thoughts. His eyes rolled back and he threw his head backwards, silent moans escaping his mouth as he tries to suppress them by biting his lip, which drew some blood. He lost all words and it felt so good that he could barely make any other sounds besides his moans.
"Saitama... Saitama-sensei I love you." Genos hugged Saitama and whispered in his ear before he let out his artificial semen into Saitama. Saitama moaned and released his load all over their chests then fell back panting."I love you too, idiot."