In the middle, the incredible mistress M makes me turn into a perverted, sadistic S in an instant

I met her as a business partner and she had a strict atmosphere and I was not good at it at first. However, I was attracted to the bright smile at the drinking party, and one day I lost my hangover, and was taken aback by her seductive atmosphere and crossed the line... Strangling, restraining, deep throating... Her masochistic girlfriend was the most convenient sex friend who lets out the stress of her everyday. However, I have become a sadistic person by the beautiful and sexy girlfriend I've ever met, and I'm so addicted to her that I can't just throw everything away...