Sauna ballbusting by good friend

A little story happend this Thursday.
For 4 years now I got a lesbian friend who I go to a sauna like once a month. She is more of the manly kind of lesbian, played football for long time, likes wide cloth and so on.
But naked she is a 10/10 very beautiful c cub boobs a nice belly good ass literally every men in the sauna looks at her.
We are good friends and a few month ago I told her about my fetish. She was kinda interested in it but we rarely speak about it.
On Thursday we where in the smoking area and there was nobody. She asked me how I got the fetish and she was interested to hear about it. She asked me how much force you need to hurt them with squeezing and I told her it's hard to tell without doing it. She smiled at me and her hand finded her way into my bathing robe and she carefully started squeezing my right nut. It felt so good and her smile was perfect.
She increased the pressure and she asked me how that isn't hurting. I said I can take a lot....
So we sat there kinda chill in the sun and she squeezed my nuts very hard....
After that she said she liked to do it more.