I don't think I have actual gyn, but my breasts have always been a little more prominent over the years depending on my weight. Right now they are probably an A and fairly nicely formed. I don't wear a bra, but do wear one of those "wear your own bra" shapers that helps trim the waist and shape/lift what I do have. My nipples aren't big, but they are a little prominent depending on my top (and how cold it is .) It depends on the setting how much I want to show, but it makes my BF happy. To tell you the honest truth, I like how they jiggle when I walk.
I don't wear tight shirts in guy mode, so I'm not that concerned about how I present when in drab.