Last night I slept in the lounge bra. I’m amazed at how full they feel this morning. Going to wear a shapewear tank to work. Don’t have the nerve to wear a bra but the tank does give support.

I too have gynecomastia  and have developed a B cup (yippy)  and want to go bigger. I can feel glandular lobules radiating around my nipple (very pronounced)
was reading nipple stimulation can produce prolactin in females and males. My nipples are very sensitive to the touch can almost orgasm like girl just rubbing them (my goal). Any way any thoughts on nipple stimulation and prolactin. I pump regularly and use topical PM cream 2x a day. My understanding prolactin is another boob growth ingredient.

I suggest trying oxytocin.  It is a hormone, but it's not a sex hormone. It facilitates the formation of emotional bonds such as those between mother and baby (especially), but is also present when one feels an intense emotional connection with someone.  It's responsible for the breastfeeding mother's "let down" reflex, i.e., the relaxation of smooth muscles in the nipple and ducts that inhibit the expression of milk.  Even if you don't intend to produce milk, the feeling of "letting down" is intense.  I haven't done it in a long time, but I would feel euphoric and completely relaxed, and this feeling would primarily be in my breasts, which would get much warmer than body temperature.  The breast tissue would become firm and engorged.

While you can obtain oxytocin in nasal spray form, I suggest the aliquot form instead.  Subcutaneous injection (small needle like an insulin needle) into the fat near my breasts was most effective.

I get plenty of oxytocin just from stimulating my nipples. Over a relatively short time I enter a state of bliss, tender feelings of love. I call it an “oxytocin high.” Not without reason is oxytocin called the love hormone. I am making love to myself through my breasts. In my case these feelings usually culminate in a nipple or breast orgasm, without any touching of the penis.

Just a quick update. I’ve noticed some growth and I’m very pleased with it so far. Attaching a pic.