Introductions discussion

A sub friend lent me his CB6000 and suggested I last as long as he did, which was seven days. Driven by curiosity and ego because I thought I could easily beat that time, I went ahead without knowing much about chastity beyond the pictures I’d seen online. I had to google how to insert it properly. It stayed on for nearly two days before issues arose—problems I hadn’t anticipated. The insertion process caused my uncut skin to roll back completely, exposing a slightly sensitive head and leading to me urinating all over myself; sleep was poor both nights due to pain under the scrotum, among other things. By late morning on day three, I had to take it out because I noticed my sacs becoming puffy with clear, red veins.

I have to admit I failed quite badly and am now nursing two very painful sacs. I dislike the thought that I might not be able to complete the task successfully, but I hope to retry once healed. During those two days, there was constant texting between me and the sub as he was concerned about how I was coping. We are both novices in this area.

He feels my inner ring might have been too small, but I was afraid a larger ring would let the device drop while I went about my daily activities. Any advice or guidance is deeply appreciated.