Sometimes the purpose of a gimp/drone/sub is to fuck. However, the problem is they should always be locked in chastity... well I have the answer for you!
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This VAC-U-Lock module is perfect to turn your sub in to a literal 'dickhead' 
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This has additional air holes around the side which will not be blocked by the dildo.
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So Doms! Ride away of your subs face 
 
Gasmask not included. Requires the S10/FM12 insert to be attached to the mask