>>2421135>does this shit actually work?
There's an element of truth to it, even if the representations aren't realistic at all. Stimulation of the breasts facilitates the growth of mammary glands and can lead to eventual lactation, but giving someone's breasts an occasional massage when you're having sex won't do much. To properly stimulate lactation you'd need to spend a good thirty minutes to an hour massaging them for the best results, and at that point you're probably best off hoping the girl in question has a lactation fetish and is willing to do it for herself.
Even then, it's not going to be a huge increase in size. About the same as what pregnancy would do, possibly a little less, or maybe nothing at all. All depends on the individual.