Female led relationships discussion

I haven’t shared an update in a bit, but she’s now taken on the role of key holder. I put myself inside and leave my key on her ring; she carries it to work with her. Usually, she removes it at night so we can enjoy some intimacy. She playfully threatens to keep me waiting another day, yet rarely follows through. The longest stretch since I started locking up about two months ago has been just past 24 hours. How can I guide her into keeping me locked for longer durations? Should I have her stop my release before I’m ready and then secure the lock again? I’m hesitant to just tell her outright because I want this direction to feel like it comes from her own idea and drive. What’s your take?