I asked the same question a while back. I now keep mine in a hanging shoe storage on the inside of my wardrobe but will need to expand soon and all of my bondage is on hooks on my bedroom door.
I don’t have kids so can’t comment on that one unless there is some way you could padlock your wardrobe or bedside drawers 
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We upgraded to some IKEA underbed fabric storage drawers recently, really helpful purchase. It stores everything apart from our liberator type things, stockades etc. Easy to slide in and out (oo-er) and cheap - but not rubbish cheap!
We keep ours in a display case that can be covered when parents come over and large killer jars to keep the fluff of the ones we like to keep in the bedroom