Ever since your girlfriend grew massive titties she has been loving the cowgirl position… The feeling of her heavy tits wobbling and slapping against her body turned her on immensely
In order to train your girlfriend into becoming a hucow, you attached large glass suction cups around her nipples and areolae and forced her to wear it at all times.
After a full month she was finally allowed to remove them. When she did, she almost fainted… Her nipples had grown big and dark and her areolae had grown massive… She officially had teats.
"Excuse me, sir? What I ordered seemed to have made my breasts grow larger… Could you tell me what was in it? I want to make some at home…"