How do you get a girl to ballbust?

Hey I'm 17 and I've been ballbusting with my boyfriend for the past 6 months and I think it's really fun!

When he first told me what he liked it was so unexpected but I was open to try new things and mist girls would be, you just have to introduce us slowly into it... For example, why not get round to it and tell her to give them a slap and tell her she'd be amazed at how much you can take and tell her to give it all she has then go on from there... there's nothing wrong with liking a little pain every now and then and if she doesn't want to just ask her to respect your privacy and to keep it to herself! I find it really fun and I know a lot of girls are interested to see how much boys can take... I think we're all somewhat sadistic really, hope I helped! :)