Okay, trying to be hip using the word "gooner" (not yet in the dictionary) this cornball "Mommy's Girl" vignette is lame. First mistake is characters stating that it's a porn addiction, when in fact it is a type of edging related to masturbating rather than having sex.
Old hat set-up has mom Rachael Cavalli collecting the clothing needing laundering in her basket, used so often in porn scenes. She catches stepdaughter Lily Larimar (looking quite different with an unbecoming dark hair color), masturbating while wathing porn.
They decide to watch porn together, cueing mutual masturbation and inevitably incestuous sex. The XXX action is professional but the scene is dull.