bro... seriously? Man, I wish these stories could just exist without doing stuff like this. I want to see the story advance, I want to see in which way the power progression works, I want to see a lot of things but the one thing I didn't want to see is MORE useless female characters that follow after the main character like a lost puppy.
Not to mention, why is he treating her completely different from the male characters he captured? She was trying to beat the dogshit out of him so she could steal from him. He even called her a bully. So, all these unnecessary niceties like asking her to call him by his name instead of Master feels so... blegh... Then again, it's exactly in character given how much of a loser simp the mc is.