Hi, I'm gladly about to get my first chastity device. My girlfriend has already chosen the one she likes. Unfortunately, it does not comes with multiple base rings: I have to choose one between 5 sizes, and ask for an extra spare ring later, paying for it (so it's better for me to get a fitting size soon!) Now, I found plenty of writnings about choosing the right ring, how it should fit tight and stuff. What i can't understand is if it should fit tight when I'm soft or when I'm hard. I see that when hard, only the biggest size would fit, but when completely soft I could wear also the smallest one. As I don't want the device to fall off when I'm soft, I'd take a small-medium size, but i'm still concerned about it chocking the blood flow in my cock and balls when I will have erections. Maybe I just shouldn't be concerned.. Veterans, help me please!