What am I feeling?

After I get about all of my index finger inside my bitch she feels less tight and the texture is akin to that of when I finger my ass. Is this still just part of the vagina or is it something?
 
Her vagina is going to dilate when she's stimulated.
Whether human female or animal.
That applies to both.
The more stimulation,
the more she will dilate.
 
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