It appears you're referring to a specific adult video (AV) featuring a married woman named Yoshiko, who is identified with exceptionally large breasts (an H cup) and the production involves a scenario related to breast milk. The content seems to be produced by or featured on NekoPoi, which could be a platform or production company involved in adult content.
MMND-195 Breast Milk Married Woman AV Impossible Yoshiko (Tentative) H Cup Big Breast – NekoPoi It appears you're referring to a specific adult