In the middle of ugly hate sex, you feel another bout of transformation coming on. You refuse to stop, but your body is hit from two fronts: your massive cock which is still growing inside her and the white hot feeling in your chest. You wonder what is about to happen.
Your chest lights up, and your back, and finally your arms. You can hardly keep a hold of her. As you thrust with your super-charged penis, your upper body becomes more womanly. You feel your muscles and bones shrinking away. Your chest cavity contracts, becoming smaller. Your shoulders move toward your head. You keep thrusting, and you are aware that you are making very strange noises.
"Yes," the woman barks, "change all the way now, no more delays. I want you to take your final form and weep. I want you to be impregnated by a cow and eaten by a dog!"
You hate her. She deceived you, she betrayed you, and she devalued and dehumanized you. Your torso feels like it is on fire but you keep thrusting, harder and harder, hoping that it will hurt eventually. The potion does its job, however, and she only experiences intense pleasure.
You take stock of your own transformation. Given how thick your body had become, you expected this change in your chest would include enormous breasts. Instead, you are disappointed to find that your flesh is only slightly more plump than it was before, and your nipples don't appear to be thicker or more sensitive. So you have big hips and big thighs but not big breasts? You are frustrated and you thrust even faster. The woman's eyes grow wide.
You grab her butt, sliding your woman arms beneath her enormous posterior and feeling her magnificent body one last time.