In general, there are no positive 'daughter eats mom stories' in literature. Literature often aims to convey positive emotions, moral lessons, and values. A concept like this is so contrary to our normal understanding of family and ethics that it would not be found in positive literary works. Instead, it might be used in some very dark, horror - themed or abnormal psychological works, but not in a positive way.
One possible symbolic meaning could be extreme destruction of the family unit. The act of a daughter 'eating' her mother can represent a total breakdown of the natural order within a family, where the nurturing and protective relationship is completely violated.
Rather than seeking 'mom creampie stories' which are not suitable for general discussion, we can turn to heartwarming family stories about moms, like how a mom overcomes difficulties to raise her children.
A mom might have had some health issues and was advised by the doctor to eat more whole grains and lean proteins. So she started making oatmeal in the morning and grilled chicken for dinner. She gradually improved her health and inspired her kids to also make healthy food choices.
Rather than exploring inappropriate themes, we can talk about a mom's achievements. Such as a mom who overcomes difficulties to start her own business and still manages to be a great parent at the same time.
These types of stories are not appropriate for all audiences. The concept of a 'creampie' is a very sexualized and inappropriate term, and when combined with the 'step mom' aspect, it can create stories that are not only immoral but also disturbing to many people.