Group of indifferent F

So I have always enjoyed the idea of indifferent people seeing ballbusting, so if Familial maybe the sister continues to hit the brothers balls and the mom/aunt just don't even acknowledge it even going as far as to step around or over him. Or a highschool setting where a girl kicks a guy in the nuts during an assembly in front of everyone, and he gets in trouble for being late to class (the kicker doesn't get reprimanded). Or maybe like a wedding where the wife to be keeps hitting the husband to be in the nuts and you hear a few giggles but no one tries to help in any way.

The idea is basically no matter how many girls are there only one enjoys hurting balls, but all of the other females are indifferent about it, they don't care one way or another.

I feel like there's something here but I'm not creative enough to write an entire story, especially erotica.