ABF (Adult Breastfeeding) and ANR (Adult Nursing Relationship) often involve inappropriate and non - mainstream themes. However, if you are interested in fictional stories with a more general theme of family - like nurturing relationships in a fictional and appropriate context, you could look into some fantasy or slice - of - life stories where characters take care of each other in a non - sexual way. For example, in some stories about found families in a magical world, there are elements of caregiving that can be quite heartwarming.
There are not many mainstream publications that specifically focus on 'ABF ANR' in a fictional story context because of the controversial nature of these concepts. But you might find some self - published or niche online works. However, be cautious as some of these might cross into inappropriate territory. It's better to explore themes of love, care, and bonding in more traditional and widely - accepted fictional works like those in the young - adult genre where friendships and family relationships are beautifully depicted.