unbirthing 

A person being shoved in a vagina whole

I love unbirthing

unbirthing by dragonbutts July 2, 2016

partial unbirthing 

Fetish of an adult head inside a vagina. Term was created a few decades ago when the fantasy of unbirthing was broken down into total and partial types with partial unbirthing being the only remotely possible form of the unbirthing fantasy. Even then it is an extremely rare activity and the practice of partial unbirthing, as opposed to the fantasy, is not a form of Vore.

See a google search for partial unbirthing

partial unbirthing by A. Akam October 7, 2007