As she massaged her nipple, Gloria noticed that her opening was feeling shallower and shallower, her fingers slipping inside less and less as her vagina closed up and reformed as the changes began. Moaning in frustration, she was left rubbing her clit, pressing her mound against her palm as she tried to relieve some of her arousal. The nub was pulsing, and she realized it was growing rapidly, pushing outward and thickening into an engorged penis that quickly filled her hand. A weighty feeling tugged at the base of her new appendage, signaling the formation of her scrotum and testes.
"Ohh goddd!" she groaned, throwing her head back as she stroked her cock, reveling in the new sensations bombarding her. Simultaneously, the changes were rippling outward: her thighs were thickening as muscle piled on, wrapping around to plump her ass even as her spine began stretching - in *both* directions! The start of a tail pushed out above her butt-cheeks, long black hairs growing from it as it lengthened and twitched, caressing her growing hindquarters and heightening her pleasure.
Gloria's hand continued to slide up and down her new member and she realized it was now almost impossibly long. She languidly opened her eyes and dropped her gaze to her reflection, stunned speechless at the sight of the enormous, dark horse cock protruding from her groin. Her hand stilled as she took in the rest of her changing form: along with her enlarging thighs and buttocks, her torso looked oddly long, and she was still growing! As her midsection stretched further, she was forced to release her new genitalia when her hands could no longer reach it. Something was squirming under the skin above her hips, and as she watched, two new limbs began pushing out of her torso, growing forwards even as her insides churned with the rearrangement and creation of new organs and skeletal support. While odd, the sensations were not painful, and Gloria absently cupped her breasts and resumed her massage, still turned on by the thought and sight of her changing form.