PKPD-410 Half In, Half Out, Half Girlfriend Mio Yukiyo Miho

I don't want a girlfriend, but I want passionate sex. I want to go on intimate dates, but I don't want to be tied down. Finding such a convenient relationship is difficult. Mio and I are in a relationship where we think about each other and have unprotected sex whenever we have free time. But we haven't said we want to be a couple, and in fact, she's sleeping with other girls too. But I love her so much that I don't want her to cheat, and when we meet, we have passionate unprotected sex. Is this a friends-with-benefits relationship? Or is it a girlfriend relationship?