So here is an idea

Steampunk Adventure
-In this steampunk world, technology is powered by a very finite resource. More and more the people are trying to create a new limitless resource of energy. Here comes MC, who develops a new source of energy. Its called a Zero-Point Crystal. Yet many want to get their hands on it, to steal it from him. 
YC is hired as a bodyguard. She is given a specialized mechanical arm. Functions on as a arm, and weaponry. Its powered by the crystals.(Unknown to her its to test the Crystals without getting subjects) In return she keeps the arm and crystals. Thats all I have at the moment, but this will be more story then smut