"...girl."
"That makes sense," the other voice, of your wolf mother, says. "He- she- had the manner of a female."
You assumed you had just been born, but you realize in actual fact you are now a zygote. Your sperm self had found the female wolf's ovum and managed to fertilize it, and you were now turning into the lupine offspring of these two wolves.
But, you realize, something feels strange about your body as you see in your mind's eye the person you will be develop. "As a human you may have been a male, but in your rebirth as a wolf your gender was up to my seed," the male wolf explains. "I see you have been formed from a sperm with female chromosomes, so a female you shall be."
Even as you try to act like what he says isn't true, you feel that he's right. You watch and feel as your mental image of your body is remolded into a wolfish and feminine shape- your ears turn pointed and push to the top of your head, your face protrudes into a muzzle with a sensitive nose and sharp teeth in your mouth, your arms and legs shift and your back contorts to make you quadrupedal as well as bipedal, clawed digits emerge on your hands and feet as they turn into paws, your skin tingles in pinpricks as fur sprouts across every inch of it, and a tail pushes out from your spine as if to signify your animal nature.
Now your body's humanity has been purged by the genes of the wolves, your masculinity starts to give way too. Something clicks in your head- the male wolf is not like you, the female is. "Good pup," she says, stroking you through her swelling stomach. Your chest alters to form teats that will swell into breasts, and the idea of having them suckled or played with entices you deeply. Between your legs your penis shrinks rapidly until it forms a clitoris, and you are castrated as your testicles move up inside you and reshape into your ovaries. Your scrotum peels open to form labial lips and a vaginal opening joins up with it. Your maleness has been replaced by femaleness.
Now your transformed body has formed, you see a much brighter light, and hear pants and groans from the female wolf. "Aa-agh!" is the sound that greets you as you re-emerge into the world, seeing the wolf that just birthed you with her belly swelling with you and other cubs. Your wolf father bent down and sliced through the umbilical cord connecting you to her with a claw, and then held you up in his arms, showing you to your wolf mother, who smiled proudly at you.