Adam's transformation - All female?

Amplified and accelerated by his stomach filled with Sarah's massive dose of "Growth X" tainted futanari cum, the pills, that Adam had taken earlier in his **** desire for a big cock, now quickly rewrote and changed his body to new and very unexpected proportions.
Unlike Sarah's own transformation, which had occurred over a span of several hours, the changes in Adam's body happened swiftly.

The first thing that Sarah saw, were her brother's facial features changing to a more soft, a more feminine appearance. Although the new face still reminded her very much of her brother, as some changes were subtle, others were very much prominent. For example his lips became more pouty, the back of his nose more narrow. His cheekbones appeared higher and more pronounced. And the most obvious change was his black hair, that grew in record time, seemingly endless waves, growing longer and longer.
And at the same time it looked like everywhere else his body hair was retreating, so that his skin was soon smooth as a baby's, flawless and impeccable, free of any blemish.

And while his face still had some resemblance to his former self, that couldn't be said for the remainder of his body.
Where his new long hair reached down to his chest, it was met by glorious mounds. A pair of clearly female breasts, standing firm and proudly, and they still grew further. Soon they were big and round, as enchanting and enticing as Sarah's own soft and delightful orbs.
Everything else around his body changed to breathtaking female proportions as well. A narrow waist, wide hips, long and lean legs.

Everything all female, with the exception of Adam's crotch area. Yet.
Sarah gasped, as a she saw Adam's skin opening up and sweet pussy lips appeared, seemingly completing his transformation from man to woman.

But above them, there still was the tiny problem of his small balls and his miniscule excuse for a penis, still fully erect and spewing a few remaining pathetic drops of jizz.