Simple experiment. Measure the distance right between under your chin and right under your nose. Let’s call this distance Scn1. In my case Scn1=7cm.
Now measure the diameter (Dg) of you favourite gag (or cock, if you have one close at hand ;-). The dildo in my mouth has Dg=4cm. With the dildo deeply in, the chin-nose distance Scn2:
Scn2 = Scn1 + Dg = 7cm + 4cm = 11cm
If you do not want to puncture you favourite cock and do want to allow easy sliding in and out and breathing with you mouth around it, add 0.5-1cm.
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