Knotted sheath

Jcbeast

Tourist
Is there a knotted sheath out there that expands when you insert your meat into it? Im talking slide the sheath into your partner then shove your meat in and your cocks diameter causes the knot to expand and yall are stuck till you pull outta the sheath? I see alot of knotted sheaths but none seem like they do this. It would be a true knotting almost.

So does this exist yet?
 
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