How big breasts might I get naturally?

Here is one article on gynecomastia that might shed some light. After reading through it, there doesn’t seem to be a standard size for men on breast size. In fact, it is more likely to fluctuate more than women experience. As for the areola enlargement, it sounds like that is very typical.

One Mtf person I knew said that they were able to naturally obtain a 36C, though I hear that size is fairly rare in her scenario.