Title: OSM: Operation Sex Mode

Pairing: Saitama/Genos
Tags: Established Relationship, Dubious Consent, Sex Mode, Resolved Sexual Frustration

Summary: Dr. Kuseno add some new "features" to Genos' body by Saitama's request. When Saitama finally gets his hands on the OSM (Operation Sex Mode) owner's manual, Genos is perfectly happy to accommodate his Master's wishes.

Warning: While I tagged this as dub-con (due to modifications being installed without Genos' knowledge) Genos has given express permission for Saitama to do anything he pleases (to Genos and his cybernetic body). Genos is very submissive here :D

Japanese Terms: Sensei = teacher, mentor, etc.

BETA: TheSupernova

"I'm home," Genos called out as he entered the apartment.

"Ah, welcome back," Saitama called back from the living room. He was propped up against his futon reading manga.

Suddenly, a thick manila envelope was thrust in front of his face.

"Dr. Kuseno ask me to give this to you," Genos said. "he told me only you were allowed to open it."

Saitama carefully opened the envelope. A large operation manual slid out. It read "OSM Operation Manual"

"What is it?" Genos asked curiously. Saitama's face split into a wide grin as he began flipping through the book. When he realized Genos was still staring, he attempted to school his features. He put the book down and eyed Genos carefully.

"How did the upgrade go?" Saitama asked.

Genos sat down across the table from Saitama. "It was successful, though he would not tell me what the upgrade was for, only that you requested the additions be made. Is there a reason it was kept secret?"

Saitama couldn't stop the grin from spreading across his face. He unfolded the futon, laying it across the floor. Sitting next to it, he indicated Genos to lie down.

"Sensei?" Genos asked, lying down. Saitama immediately ripped Genos' clothes off, destroying them in the process.

"I am a man, you know." Saitama said, his voice serious, "I can only abstain from sex for so long."

Genos' cybernetic body had lacked the basics needed for sex. Saitama had Dr. Kuseno rectify that. He reached down between Genos legs, sliding a finger over a small touch pad. It glowed green, scanning Saitama's finger.

"Master Saitama confirmed. Sex mode activated." Genos said mechanically. A white liquid began coating Genos' body, as Genos' cybernetic parts slid and collapsed within themselves. Eventually his body smoothed out and the liquid solidified into a skin-like substance.

Genos looked human. Soft skin, a smooth stomach and delicate frame. A small cock and balls hung between the man's legs. Saitama slid his finger down Genos' cock, watching in amusement as Genos' body arched at the new sensation, a moan escaping the man's lips.

"And this," Saitama said, his finger circling Genos' new anal hole, "is where all the fun begins."

"Sai… tama…"

"We're going to have so much fun." Saitama pressed Genos' wrists above his head. "You're mine, Genos, and I'm going to make sure your body knows it. Saying 'I love you' isn't enough anymore."

Genos cocked his head in thought. After a moment, he relaxed his body and smiled, unconsciously licking his lips.

"I understand, Master."

"Good boy," Saitama said. He possessively smashed his lips against Genos' open mouth. "I'll teach you everything you need to know. You're my Personal Sex Cyborg, after all."

Fun Trivia: Chii from Chobits had her "activation switch" in the same area as Genos and only Saitama can activate Genos' "Sex Mode". *evil laughter*