Hi A,
Did you see this:
https://female-orgasm-denial.tumblr.com/post/160445894488/i-have-something-to-ask-you
Give him that, edit it however you want (mostly telling him you like the fact you’ve never cum, and maybe find some bits from the Brand New in Box blog to encourage him), but give him that and see what happens.
And be careful what you wish for 😉
Good luck sweetie.