Japanese Bulls

Are there some people who knows japanese bulls?
Is someone cuckolded by a big japanese boy?
Please tell the story here.

I was in japan three times. beeing a white boy and very small (4.25 inches erect) I found a japanese girl because I am white and tall.
But when it comes to sex I had a problem.
After some time when I came home she was nailed by her former japanese boyfriend fro behind.
He was a lot bigger than me. It was humiliating.
They stopped and she wanted that we compare sizes.
Side by side. It was intimidating. He has about 6.5 to 7 inches ans was the hell lot thicker.
Then they continued fucking.

Has anyone a similiar experience with big japanese men?