Question for people in ballbusting relationships

This is more for couples, long-term or married, that are both into ballbusting. But how do iniate ballbusting sessions? Or more how do they come about? Not talking about ballbusting during sex, but where the main point is ballbusting. Maybe a part of that is an orgasm at the end, but the main thing you are doing is ballbusting. Does the woman come home from work one day, had a bad day, and then just asks her guy if he wouldn't mind letting her beat his balls up for stress release? I'm just curious because I've been married for 13 years, and the wife will bust my balls, and hard if I ask, but she isn't into it at all. She does it for me because I like it, and she's alot more ok doing it now than at the beginning, but I've always been curious what it would be like if she was actually into it as a fetish. Because ballbusting only happens during sex for me. Or if she's really horny and it's a kind of tease until we can have sex. So if anyone wouldn't mind just describing how they happen IRL, not just porn purposes. But feel free to talk about the types of ballbusting as well if you like.