Nothing more than a granny justifying her lust for her son's friend, though the affair happens to be the cause of her son's demise. Pure BS, suited for those who are desperate to stray , selfish & unwilling to have any morality or responsibility.
Coincidence is that the final scene is that the lovebirds (?) I.e. the granny & the minor boy waking up in a dark cave and fondle each other, which implies that they went back to stone age where no Value and respect for culture & morales.
Felt really bad I wasted 2hrs of free time.