Erotic lactation is a specific fetish with its own consent issues, because it involves someone else's body and, often, their feeding plans.
What the research is about
Sex and Psychology explores men's breast-milk fetishes. The boundary is the same as any other body fetish.
Source: Erotic Lactation: Exploring Men's Breast Milk Fetishes, Sex and Psychology, March 20,
- Figures, samples, and methods are on that page.
How this shows up in public play
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Do not ask a stranger to lactate for you.
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If two people want adult nursing, they plan it. A dungeon floor is not the planning meeting.
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House rules on fluids still apply.
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Comments on someone's chest are not a scene.