Chastity and orgasm denial discussion

My bottom and I have made up our minds to purchase the neosteel arch! We picked up the measuring kit roughly a month back, but it hasn’t arrived yet. My sub is getting restless, questioning whether we should just proceed with buying the arch now. While we do have a holy trainer currently in use, we really desire something much more stable. Is sticking out for this worth the time? What can I do to maintain his interest and keep him eager for chastity during the waiting period?