Anniversary domination with girlfriend [MF]

I have been spending some time on this subreddit and listening to you all has inspired me to post a story of my own which happened today.
I (23M) have been in a relationship with the love of my life for one year. My partner (22F) is kinky and during our one year together we have done a fair share of ‘wild’ stuff. This story in particular involves some light (i understand there is no objective criteria but it’s mild at best) rough play so if that’s not your thing then you should leave. This story is going to be very long and detailed.

I think at this point i should give you guys some background on us. We are from a fairly conventional country, one of those which you might think of as still living in the 1900s. But enough of that, I’m a 5’11 guy. The perfect world to describe me would be lanky. I have a decent face and I’m fairly smart. Oh also, my dick is almost six inches long i believe. My gf has a petite body, she’s also skinny, has 32B boobs but they look bigger on her. Has a nice ass and the most beautiful pussy ever. As i was saying earlier, we are fairly kinky and my gf introduced me to kinky stuff, she likes to be dominated in bed. She loves to be slapped and generally likes being ordered around during intimate times. However, she has been struggling with all this stuff for some time since she feels icky about the whole thing from a feminist point of view. I feel like I’m giving too much background information so on to the story.