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Hi, it's just simple idea.
I have a two stage penis and balls vacuum cylinder, a handcuff. 
Here's the plan put the keys inside cylinder and vacuum sealed my package. handcuffed myself from back and now try to free myself.
It's not really bondage but needs lots of effort and times against you as swelling developed.
 Any idea to improve it?
I can involve a partner in play.

Thanks and sorry about my bad English 😐

I was thinking about it, however my experience with vacuum pumps (I only have one cylinder which covers"the whole package") shows, that any wrong movement affect the sealing, and even if you don't move, the air will get it much sooner. I might have to try a "penis-only" cylinder, I hope it keeps vacuum better.