the spikes tore puncture wounds in their backs as they thrust against one another , pain and pleasure joining into one siamese twin entity in their conjoined bodies , and culminating in a simultaneous orgasm that was at once both unbearable ecstasy and excruciating torment , nirvana and hell in a double helix of light and darkness , sex and death , that possessed drelrei 's phallus like angry ghosts and their poltergeists , ejaculating fire and ice , attacking junisia 's womb like a rabid demon from within .