The young mother had been looking at her son's dick for a long time and he took advantage of it. When no one else was in the house he easily tricked her into sex. And as I see it, this hungry female didn't mind letting him see her charms. Only she didn't expect him to get that close to her ass so fast. But it was payback for her lust.
Sex with some stranger or new partner has its positives. It adds to the experience, even the thought of such a forbidden for many is arousing, counting on the stamina and imagination of the partner. Sex in the bar is somewhat relaxing and not as luscious as on the bed. This couple's anal sex and caresses deserve praise and encouragement.