Female led relationships discussion

Does anyone else deal with this? My mistress wants to give me a regular spanking. I’ve been spanked by her before, and usually end up begging her to stop. However, the more I plead, the harder she hits; she says it only stops when she decides so. She’s made me cry on several occasions doing this, and just thinking about having to submit every two weeks fills me with dread. I will go along with it since it is what she wants, but any advice on how to manage better would be appreciated.