Fully nude, you decide that entering your cat feetfirst would be smartest, for if she can't take you in, you can still breathe and help get yourself out. So with a deep breath, you sit down and slide your feet towards your eager cat's vulva. She seems almost too eager, but you dismiss that thought and direct your attention back to your unbirthing. You slowly slide your toes inside of your cat's warm vulva and she immediately starts purring loudly. You are amazed at the tightness of her vulva, but at the same time you are very quickly being pulled in, towards your new home...
Meanwhile, your cat is enjoying herself greatly. She is pulling you inside her as quickly as she can to sate her empty womb's appetite for fullness. Taking in an entire human is not going to be easy, but she can feel herself stretching as her reproductive organs start pulling on you more, sucking you inside. She spreads her hind legs out wider as your feet pass through her cervix and into her womb, for now she will need to start taking in the more difficult portion: the rest of you. She watches you inch your way in, bit by bit, and in moments your shins are mostly inside and your knees are just about to disappear as well. She looks back and sees her belly starting to expand with your feet and now your lower legs inside. Soon enough, her plan will be complete and you will be exactly where she wants you...
Back to you, you are up to your waist in your cat and can't help but feel aroused by the feeling of your cat's vulva on your cock. You are at first embarrassed, but then realize that you are halfway inside of her, so it is kind of expected. Besides, she doesn't even seem to care. If anything, she likes it, for the speed at which you are being sucked inside increases. You can't believe that your cat is able to fit you inside her womb, for you are a lot bigger than a kitten. Most interesting is the fact that despite you being inside her from the chest down, her belly looks no larger than if she was ready to deliver a large litter of kittens. You imagine that you must be feeling what unborn kittens feel when they are being born, but in reverse, for you are curling up inside her womb quite tightly. Also, you realize with a start that you cannot do anything, for you have somehow managed to pin your arms at your sides. You wiggle your fingers and can feel the soft inside of your cat's stretched out womb. Suddenly you feel something at your navel, then you notice that you no longer need to breathe. That is when it hits you: somehow, your cat's body must have registered that she was pregnant, so an umbilical cord must have grown and attached to you. But she isn't really pregnant...is she?
Back to your cat, she is ready to finish up your unbirth. Your arms are pinned to your sides, and with an umbilical cord connecting you to her, she knows that you have no way to escape. She has you right where she wants you. Even if you somehow got free, you could't go far. She feels relieved as she feels your shoulders pop into her womb because the widest part of your body is now though, and with only your head remaining outside, she prepares to become fully pregnant...
As your head is slowly sinking in, you speak to your cat for what could be the last time for a while. "Alright cat, now that I am almost your kitten, I need to tell you a few things. First, you can be pregnant with me for as long as you want, but if I kick three times and poke three times on the right side of your belly, I want you to give birth to me. If you do, I will go back in as soon as I can, but hopefully we will be better friends by the time I get out and it will not be needed. After all, no bond is stronger than mother and child. Now that that is out of the way, go ahead and make me your kitten, mom." With that, you take one last look around, then your thoughts return to your cat or, soon to be mother.
She meanwhile hardly paid attention to your words, for she didn't care. She would be getting her ultimate revenge on you. She looks back at your head sticking out of her vulva and knows what she needs to do. She takes a deep breath, then squeezes your head in between her hind legs, forcing your head in, then clenches her cervix shut hard, squeezing your head inside her tight womb. She relaxes as she feels her cervix close tightly, sealing your fate. She looks at her vulva and is pleased to see that it has returned to its normal, tight appearance. Her belly looks large, like she is pregnant with a large litter of kittens, not like there was a whole human inside her womb. She walks off to find a cozy place to take a nap and relax. After all, she is pregnant...