The b/g/g trifecta has always been: Twins, Sisters, or Mother-Daughter.

To have Sisters AND Mother-Daughter going on in the same scene is

The only thing that could possibly make that any hotter was if the sister's were Twins. BAM! Hat Trick! All three in one scene.
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I'd rather be ignorant than stupid. Ignorance implies a lack of knowledge which is easily correctable through education. Stupidity implies an inability to learn. Therefore; ignorance is temporary, stupidity is forever!