Could be father&son or fem!Harry

 

I think you are asking in the wrong neighborhood . ;/

 

Tsume Yuki has done some female Tony Stark fics, though I don't know whether she's done any HP/Tony ones. (This isn't really a ship I haunt.)

 

There's always "Invincible Technomage." It's a guilty pleasure at best, and features incompetent Dumbledore, wizarding Britain being a complete backwater, lots of mugglewank and other distasteful tropes. I suppose it's worth a look if you're desperate, though.