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When attempting to insert fist inside anal canal, the hand starts by making a funnel shape with the four fingers and thumb, simulating fecal matter leaving the anus. Similar to fetal funnel when the same process is applied to the vagina.
I applied the fecal funnel on her before she had an anal reflex and defecated on me.
via giphy
by agentmiket013 September 27, 2017
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