You gasp in wordless fear, immediately fumbling past your udder to grab hold of your penis before it can be taken from you. The fullness stops behind its base, seeming almost confused, before exploding into a burst of pleasure that collapses into a distinct and powerful emptiness. Your shaft jerks in your hands from this, and you almost lose your grip.
The emptiness is pulling inward already, and with two soft pops it pulls your testicles up into your pelvis, transforming and blossoming as they go into ovaries that feel very real and quite fertile. The changes hit you with even more more pangs of pleasure, and you start leaking from the tip of your penis even while the empty scrotum below it bunches up and inverts itself, reshaping and tightening around your penis into what are clearly the inner and outer lips of a vagina. You struggle to keep your grip on as the fluid starts rushing from your tip, flowing over it and making it slippery and even more sensitive while it slowly but inexorably grows thinner and shorter and almost painfully sensitive. The moment the fluid touches your lower lips, they too become slippery and slick, the area below your penis being pulled inward while you hold on to the last masculine remnant of your old self. The hollow space beneath them grows ever inward, forming a passage that would have entranced you yesterday, but fills you with alarm now. It keeps widening and tunneling inward, until it reaches the space behind your shaft and, with an almost triumphant flourish, unfurls into a true and fully functional womb, deliving what feels like a gut punch from inside your body. It makes you finally lose your grasp on your shaft, with rushes up to join the rest of your new anatomy as the clitoris, firmly ensconced in its new home.
Finally defeated, you sink down to your knees and look at what your body has become, this strange motherly bovine beauty whose body you now inhabit. Uncertain and confused, you wrap your arms around yourself and start breathing deeply, trying to collect your thoughts.