Not sure if there is a term for it but I like to call it "the face". It's when a woman clinches her teeth with her lips puckered out while getting fucked. Almost as if she's saying in her mind "this cock is too big for me but feels so good at the same time".
Brownie points if she does that angry grunt while doing the face.
Here is a pic of what I mean.
Brownie points if she does that angry grunt while doing the face.
Here is a pic of what I mean.
