[PleasantlyFascinated]

And I'm one of the weird ones   I am a man and I want to stay that way. I grow a beard, I adore men’s underwear and I don’t have any women’s clothing items.
However, I adore breasts. The breasts on a man are attractive to me, and I have always wanted to have them. Nature played a little with me, I have gynecomastia. My tits are not big and I would like them to grow by one cup, maximum by two. If they will be very visible, I will wear a compression undershirt.
I am here to discover how I can achieve this

I'd say you're in the right place then.  You could search this site for a year, and still keep finding new things to help inform you in your quest.

Presumably you are trying to avoid any feminization, except for your breasts, which is a bit like trying to run in opposite directions at the same time.

I know what I would do, if I had your objective.  I’d start with muscular hypertrophy of my pectoral muscles.  If that did not satisfy me, I’d begin topical estradiol, to keep the highest concentration of estrogen as close to target cells as possible before the estrogen went systemic.  I’d hopefully mess with my androgens as little as possible, unless it were to try and boost them.  I’d keep my body fat percentage low, in order to minimize aromatization of T into estrogens.  I’d use aromatase inhibitors to spare my endogenous testosterone as much as possible.  I’d avoid things that counteract conversion of testosterone into dihydrotestosterone.  I’d also worry a bit about developing BPH, since some of the inevitable circulating estrogen metabolites would reach the prostate.