The week after you and Sarah had your first taste of NutriGrow passed by with little incident. Your clothes all fit the same, your perspective hadn't changed, and Sarah didn't seem to grow any, either. You reasoned that it was only the first dose, so the chances of seeing results this quickly were slim at best.
But Sarah was a woman possessed. Using her biology class time, she took a small sample of the serum and analyzed it, studying it's properties and chemical makeup. She cross-referenced her discoveries against some of her biology textbooks, and even dusted off her old chemistry textbook to help her understand what she was seeing.
And unknown to you, Sarah found a compound within the serum that functioned as an inhibitor, to slow down the serum's effects. And she devised a counterpart compound that would disable the inhibitor. Using 'borrowed supplies' from class, Sarah created a few ounces of her 'inhibitor blocker' formula, and would begin taking it after her dosage of NutriGrow.
____
You both were on your fourth week of NutriGrow, and you had begun seeing decent results. You gained an inch in height, making you 6'3", and had packed on about 15 pounds of muscle, trimming up your frame nicely with toned beef. Your dick even saw some improvement, and you had more stamina in bed, which Sarah approved of greatly.
Sarah, however, saw incredible results with her custom formula. She had gained 3 inches in height and 50 pounds of muscle, with her breasts having spilled into D-cup territory. Her 5'8" frame was thick with feminine muscle, and she had begun a rigorous exercise circuit at the college gym to pump her muscles even bigger.
You both loved the effects that the serum had, and a week ago you joined Sarah at the gym, trying to jump-start your own fitness. You two excited each other to no end, and after every gym session, you and Sarah would return to the dorm to have sex, your lust for each other obvious to all.
____
You laid on your back, with Sarah on top, riding you. Deep into a kiss, you two moaned into each other as you ran your hands up her body. Beefy thighs lifted and lowered her onto your shaft rhythmically, her slight 6-pack flexing slightly as she breathed heavily, large breasts hung in front of her chest, her thick arms holding her up above you.
She broke off the kiss to lean forward and whisper into your ear, "Feel how big I am, Moe. Nnngh, don't you love my muscles, my height, my boobs?" She teased, "Mmm, imagine how big I'll be in another month."
Your breath was ragged, but you managed to respond, "Imagine if you grew faster, or if you grew bigger every time I came in you," you fed into the fantasy.
Sarah moaned, "And what about you? I want you to get big, baby. I want you to - mmph - get huge, get massive. We can be two giants among men."
"All I want is you, Sarah," you groaned. "I don't care what size we are, I just want you."
Sarah pulled you in to a deep kiss, and you climaxed together.
As the two of you laid in bed, Sarah made up her mind. She had knowledge, she had supplies, and she had your support. For the first time ever her dreams were being realized, and shared!
She knew what she wanted to do.
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