Chastity and orgasm denial discussion

Hello, My girlfriend and I are really into chastity and have a CB-6000S. I’m holding back on using it because I worry about ball stretch. We like things high and tight, so the last thing I want is for them to drop lower or for the skin to loosen up. Meanwhile, she wants me locked away to stop any masturbation. Right now, my lockup sessions will likely be no more than a day or two at a time. Some people report little to no change, but there are also plenty of accounts showing significant and permanent shifts. Any advice, personal stories, or suggestions would be awesome!