If you want to try it I could make you one that would feel very close to the real thing that you could get in and curl up ......
Or I could gladly help you out if you want to make one yourself ...
I can make you any kinda toy ,machine you could possibly think of ....

If you search for
"US student is rescued from giant vagina sculpture in Germany"
on Google, you will see that

"On a Friday afternoon in June, a young American in Tübingen had to be rescued by 22 firefighters after getting trapped inside a giant sculpture of a vagina. The Chacán-Pi (Making Love) artwork by the Peruvian artist Fernando de la Jara has been outside Tübingen University's institute for microbiology and virology since 2001 and had previously mainly attracted juvenile sniggers rather than adventurous explorers.
According to De la Jara, the 32-ton sculpture made out of red Veronese marble is meant to signify "the gateway to the world".

So, be careful how you exercise your fetish!
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www theguardian com /world/2014/jun/23/us-student-rescued-giant-vagina-sculpture-germany

The psychology books are full of odd fetishes and abberations, this is a lesser known one.

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Unbirth

Unbirthing (also known by the Furspeech term, Re-Whelped) is used to describe the paraphilia involving the desire to be "swallowed alive" by female genitalia, or when a female fur takes another into her womb and "gestates" that fur for a time as her own unborn ****. A less-common but still significant minority also practice UB-Vore, wherein the female unbirther's body ultimately consumes the unbirthed. Another variant on this is males absorbing others (generally other males) as a form of male pregnancy. This is known as cock vore and often involves Hypertrophilia and/or Macrophilia.
For obvious reasons, these sexual fetishes solely exist within the realm of (mostly) furry fantasy art and stories.


There are several different, slightly overlapping camps of thought regarding this philia:
For many, unbirthing is attractive in its symbolic meaning. The opportunity to trust someone quite literally with one's entire life, to be nurtured and protected, is what attracts the unbirthed. On the other side, the unbirther can demonstrate her care for another in a deep, trusting way, and enjoy something living inside her, a sensation often attractive in and of itself.
For others, unbirthing is a form of dominance (hence the vore aspect). The attraction of unbirthing centers upon the control gained over another creature: the unbirthed's freedom or movement is restricted, and their senses are (at best) muffled. The unbirthed is totally dependent upon the unbirther, relying on them for sustenance and oxygen.
Another aspect of unbirth attractive to some is the age-regression scenario which may take place inside an unbirther's womb. Returned to the womb, an unbirthed creature grows younger; the unbirther may choose to rebirth their guest at any point or simply regress the unbirthed past the point of conception, effectively erasing their existence. There are many variations on this theme, some overlapping with the oviposition philia.
A fourth group comprised of the overlap between fans of unbirth and those of vore lies in the endosomatophilia paraphilia, or attraction to fantasies involving complete encapsulation of a living thing within the body of another living thing. A second overlap between the two lies in absorbing or digesting an unbirthed creature: a form of genital vore.
Unbirthing media[edit]

Even though unbirthing art is not uncommon and may be found in the work of Mamabliss, Duo Radon, MrPerson and others, no single graphic artist stands out in this particular field. Within the furry writer community, some noted authors of such stories are Dream Weevil, Animakitty, Grolbek, JessKATT, Smokescale and Rochndil.

I like your fetish. I'm not sure how I would practice it though.