In short, I'm actively into a long-distance relationship which has bdsm features in both sexual and non-sexual times. I'm switch and acting as dom; partner is effectively sub. We just talked a bit about what I'll need to get comfy with when we are at last together; one part isn't going to be a problem (I'm the kinkier one in the relationship), but the other is that I'll have to learn to punish them, usually with pain. I have a pretty hard tendency to not want to hurt people, and those I love even less so. How can I learn to either like giving him punishment, or at least tolerate it enough to help him? Thank you all!

Edit: punishment here is to help mu sub destress; I would be happy if i didn't need to punish them but alas I do for their sake.