Ambiguous tag. For when an inanimate object is sexually penetrating someone, use Object Insertion. For when a Penis is penetrating someone, use Sex. For when fingers are penetrating someone, use Fingering. For when a Tail is penetrating someone, use Tail Insertion.
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Penetration
1,281,036 posts1 sourceWiki updated 10/14/2014
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Penetration Gallery
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belle (zenless zone zero)
zenless zone zero · by simesaba (xwdt4337) · rule34.xxx
burnice white
zenless zone zero · by nodusfm · rule34.xxx
finn the human
adventure time · by cappulait · rule34.xxx
miya chinen
sk8 the infinity · by g1 (artist) · rule34.xxx
asgore dreemurr
undertale · by trinity-fate62 · rule34.xxx