Intrauterine Omophagia

Rosemary's twins, sharing a cell, uterine prison
 One of the twins wearing a sinister, menacing grin
 Satan's young, juvenile, embryonic children
 Only one unborn can survive
 Feeding of the nutrients, one of the twins is thriving
 From a lack of nutrition, the other twin is dying
 An opportunity has granted this spawn to subsist
 It most consume the brother to gain strength to live
 Gnawing tearing into undeveloped tissue
 Rapidly expanding gestation mutation
 DNA identical
 Ingesting the ventricle
 Parasitic demon spawn
 Has outgrown its host
 Bulging her bloating belly
 Till her skin explodes
 Born to a mess of skin, blood and guts
 Ushering in a new era
 Intrauterine omophagia
 Meets a satanic millennia