Despite being the most advanced example of AI in the world, Ultron made a very, very foolish mistake when he was in the process of designing his physical body. Could it be fixed? Sure, with some hassle, he could redesign a new vessel that excluded his little issue, but that was, admittedly, a lot of work just to escape having to deal with a minor convenience. As annoying as it was, it would probably be a better choice to hold off until the creation of a new body until something seriously went wrong with his current one.

With that in mind, Ultron just had to grumble and continue dealing with his little problem. Somehow, he’d thought that adding systems that required oil to his body was a good idea. It was not, in hindsight. He’d accidentally signed himself up for a lifetime(or the lifetime of his vessel, at least) of doing oil changes on himself like one would do to a vehicle. Ultron was not a vehicle, and it strongly displeased him to have to look after his vessel like that.

grabs u. i want to preface this by saying i know ultron probably doesnt need oil changes in canon!!! i just thought it'd be fun to have an excuse to put my fingers in him(smirks) and stuff,,, so. just. shhh ignore the canon for a little bit and change his oil filter okay

its not specifically stated HOW you ended up with him, so you could be dating(?? if ultron dates), he could've kidnapped you, you couldve defected from the avengers etc etc whatever

AnyPOV! Human! User. it's briefly mentioned that he took you from the avengers, so you could be an avenger, an avengers partner, blah blah its your rp you can do what you'd like