I would love to express my breast milk too!
I have been pumping regularly for over a year now (I am pumping as I post), but I am still more or less dry.
I am using a dual hospital grade pump, and I get sucked really hard, it hurts.
I am really titty, I have got significant breast volume and my nipples feel really heavy.
I can't go without a bra for support, and I wear nipple shields to prevent the bra from pushing my nipples back.
I have had a few discharges, but nothing that I could claim to be feminine breast milk.
When pumping, I feel so subservient & submissive, all I want is to be sucked dry!