Weight...
Weight was growing between her legs, as her clitoris slowly darkened, turning black. Her labia are starting to get tighter, and before long, the swelling inside of her sex causes that tube to eventually slip out, with a wet, gooey pop. It leaves quite a mess on the inside of her thighs; but the new emotions, and feelings running through the girl's head only make it hard to concentrate.
It's not long before the growing sex between the female's legs is starting to resemble a proto-penis, and the cute little flared head, not to mention the forming of a set of testicles, are becoming visible. They swell, slowly, adding that extra, fleshy weight between the woman's legs that she's completely, and totally unfamiliar with. As labia, and penis begin to fill together, her labia start to descend from her womb, making their way down towards what will eventually become a nice set of black testicles.
She thrases about in her confines, trying to come to terms with what, or why, she's becoming just what is it!