2 Bald Cretins Saving the World (OPM OC Insert)

3 years of training have granted him unimaginable strength but at a heavy cost, unimaginable boredom, and hairloss. All emotions dulled day by day. That's what Saitama's life was like. Thankfully, he has a loyal companion that helps him feel a little more human.

A Sphinx cat named Maggot.
Maggot is a cat with hyper-intelligence and the power of invincibility. She's been with Saitama before he became a hero, and she's ready to stick with Saitama no matter what comes their way.

Life was mundane, but they were content.
Who would have thought that saving a cyborg would thrust them into an adventure of a lifetime?
Also Saitama gets a harem.

(I do not own One Punch Man, just Maggot and any original character. This will be following the manga instead of the anime for personal reasons. Chapter length will be similar to the anime, with around 3-5 manga chapters in one for mine, numbers will vary. I use Zoro to watch the anime and read the manga, I highly suggest it for everyone else.)