Started free use but also degradation…

Hello, so my wife 33(f) and I 27(m) have entered into a free use agreement. I’m confident in my ability to use and be used at a drop of a hat and had resounding success in our sex life because of it. The thing I’m having trouble in is she wants to be degraded “organically”… and try as I might I get it right about 30%-40% of the time. She says I’m doing alright but it either comes out to wordy or forced and I don’t know what I can do to necessarily correct or fix it. How does one make it “organic” without it becoming repetitive?