Female led relationships discussion

I trust I’ve posted this in the correct section. My wife and mistress have played with these ideas over time without fully committing to chastity or pushing her domme role too far. Lately, we’ve ramped up the intensity, and both of us really appreciated it. Chastity is now mandatory; having tried a CB3K (which felt a bit tight) where the curve was quite visible under clothes, and a loris tube (where I struggled with fit), I have placed an order for a Looker 2. It arrives just in time for her, followed by my birthday three weeks later.

Since it’s meant to be a surprise, what do you think is the best way to present the key? What’s the most thrilling, humiliating, sexy, or submissive approach (or whatever suits your taste)?

I was considering testing it out for several days, locking myself away and handing her a necklace with the keys attached. Alternatively, I could photograph my device, mail the keys to her office on Friday, then meet her for dinner where I can reveal them.

I welcome any ideas. And hopefully, this is indeed the right spot…