Hi, if you are quite serious about it, then go for breast enlargement surgery. These days, it does not cost much, but think before doing it.
I know few cases, where men got exposed to certain hormonal products or steroid products had enlarged breasts. They went through a surgery to reduce them, as it became hurdle to their marriages. Also such kind of enlargement also had impotency as major another side effect. So the safe way is to go through Breast enlargement surgery. You need to consult with a plastic surgeon for that.
If wearing bra is only your fantasy, then just wear it. You can get A cup bra and wear for your satisfaction. No harm in that.