Suckling will help the mother loose weight and other dozen of health benefits for the mom but the person who drinks milk will get fat, and it's what babies need.
A subreddit devoted to the topics of Adult Nursing Relationships, Induced Lactation, and anything related to breastfeeding between adult.
Breast feeding is known to speed along weight loss after pregnancy. There's also research that suggests inducing lactation can reduce the risk of breast cancer. It seems there’s a clear intimate bonding experience that occurs during adult nursing that is pleasurable to both.