Rewrite this story as a bratty teenage tomboy: 
"Such a lovely good girl for me," NAME_1 whispered against her submissive's temple and guided the pumps back to her aching fat breasts. "My my, haven't your little teats swelled so quickly now the medicine is bringing things along?" She firmly pressed the suckling pumps and locked the pressure tight.
Responsively, her girl whimpered out a muffled cry through her gritted teeth.
"The medicine makes them hurt," she whispered to NAME_1 and steadied her breathing into the painful harsh tugging on her nipples. "The medicine makes too much milk Ma'am. See? Please no medicine today--" She came undone with a defeated whine at the sound of gloves snapping.
NAME_1 smiled down and prepared the chemical stimulant, then flicked the tip of the syringe and waited a moment for her girl to behave, stop cowering, and present her pushed out little teats.
"We can stop the medicine when your nipples stay fat, wet, and dribble all on their own kitten. You heard the veterinarian." NAME_1 firmly grabbed a wet pink teat and pulled it taut from the chest.
"Hurts, Mistress!"
"Big breath now."
"Please Ma'am! It stings..." NAME_1 listened to the pleading melt into blubbering tears as she pressed the syringe, slow and steady through the fat tip of her teat at first, then watched it disappear deep into the milk ducts. "Mistress it's burning..."
Without fuss, NAME_1 removed the needle and pressed a cotton ball into the few droplets of blood that pinkened her cream white milk supply. Then she administered the second syringe, slow and steady, puncturing her girl's nipple ducts and spiking her milk supply into overproduction.
"All done. All done now, sweet girl, your teats are all done for today." NAME_1 crooned as she lightly massaged each hot swelling teat. "Lets unlock your chastity belt and measure that big, fat growing clitty of yours ready for its special medicine too and then we can fix your cunny pump after bath time."