Novices and newbies discussion

Hello So I’m waiting for my first ever cage to arrive in the mail. It should be here within the next week. I’ve been so excited about getting it. I’ve mentioned it to my gf while we were fooling around and she was very excited about hearing about it while we were mutually masterbating. Fast forward to this past weekend and we were messing around again and without noticed she asked “when I was going to get my penis box”…I was like you really want that? And she was like yeah. If it will help you from masterbating without me and stop erections at work…yes I think it will be good. I then told her she would be in control of my cage. I was so excited she asked about it She doesn’t know I already ordered it. Questions: Should I try it out for a few days before telling her? Do I just put it on and present the key to her? What is the best underwear to wear during the day at work? I need something to stop the pulling on my balls and cradle it more? Right? I’m a heavy leaker when it comes to being hard then soft so much…will the leaking still occur? She’s the one that knows I get hard a lot during the day because she does laundry and sees the stains everyday. Thanks for the newbie help!