Oh dear god!
Koukuji_Family actually made them!
Run for your lives! Guard your vaginas!
Somewhere outside the kingdom of Helvabon lies a relatively secret cave. This cave houses a legendary sword known as the Lifebringer, a sword with the very power of Life itself, as the name would suggest. This magical blade is guarded by a... rather peculiar group of what appear to be youngsters in loincloths. They don't look like your average little boy, what with their green skin and pointy ears, and each one has different hair color. They have been spotted once or twice in the kingdom, but they mostly guard Lifebringer inside their cave.
...That is, until a clueless
knight-in-training up and snatched it.
And now, they're understandably annoyed...
The strange children have become much more active as a result, some hunting down the scoundrel responsible for stealing their beloved sword, but most are just running wild. Because of this, their traditional habits have become a bit more apparent to those that have began to study them.
These creatures, recently discovered to be an all-male species, have the unusual habit of seizing women and... cramming themselves into their wombs. Once inside, they settle in, as if their 'host' were actually pregnant, for a period of approximately one week as they grow to adulthood, which will... probably be difficult for the 'mother'. Once the week is up, the host gives birth to a more mature creature. They then proceed to... rape and impregnate their 'mothers', as this is the only way for them to reproduce without the sword. On some occasions, they even devour them whole, either the natural way, or with... their cocks, holding their prey in the scrotum.
These strange, incredibly naughty creatures have been dubbed 'Uterus Goblins', due to their goblin-like appearance and their tendency to invade the uterus.