Story to show my girlfriend?

For the past few months I've been incorporating ballbusting into my relationship, tho we've never discussed the topic openly. I first asked her to squeeze, and eventually to kick my balls, with great success!

She kicks HARD, and seems to really enjoy it. Therefore, I want take things to the next level by showing her a bb story that shows what ballbusting is all about, and hopefully inspires her inner dominatrix. (Also the mere thought of her reading a ballbusting story and not hating it turns me on immensely.)

The problem is I've been reading ballbusting literature for so long that all of my favorite stories are too extreme to show her.

Therefore I'm looking for a light ballbusting story involving a boyfriend and girlfriend, preferably one that's consensual, and doesn't go TOO far. Definitely no castration play... yet :D Anyone know of a story like that?