Just ONE PUNCH?!?! (one piece x opm reader/oc)

The reader is from the one punch man universe, she is best friends with Saitama and was doing the 100 push-ups, sit-ups, squats, and the 10k run exercise alongside him. So to conclude she's just as strong. One day when fighting a monster she was thinking about dinner and didn't notice she was put in a portal to another dimension. When she wakes up she is in the one-piece universe. She realises that a) she's not in her universe anymore and b) she has gotten younger, she is no longer 25 but now 16. She ends up getting found by Garp and is told to live with his other grandsons Ace and Luffy. She's not bothered to complain goes along with it. (just a reminder shes still just as strong as her 25-year-old self when she turned back to 16)

Okay, probably a crappy description but what can you do.
I do not own One Piece or One Punch Man or any pictures that I may use. I also do not own the cover photo. The only thing I own is the slight alteration to the plot and my oc/reader descriptions

Start: 6 April 2021
End: ???