Attache-chevilles 

Make it smaller, stronger? Solution

Just use another small lock and then use this product to lock up the small key in a metal box. You can even have a backup small key somewhere else that is inconvenient, embarrassing, messy, etc, to get to. For safety, maybe choose a place that's quick but messy. Ideas?
For some uses, a sealed envelope. Another idea, your lover knows where an extra key is, but won't tell you until you perform a task. Or you can wait--your choice. Ideas?
J

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