As Derrick was swallowed up inside the Cerebus, he started feeling even more confused and disoriented than he ahd been before. It felt like he was being pulled apart, his awareness dividing, yet staying connected. And that was exactly what was happening to the former boy - his body was splitting into three different lumps that each developed three individual heads. When the strange pulling stopped, Derrick's consciousness was divided into three three-headed puppies, nine different points of awareness. He struggled feebly for a while, two female, one male, each trio of heads connecting to each other. Derrick was all, but found he was most conscious of the male. Being male was all that was left of his past, and he clung to that identity as best he could.
The warmth, pounding of the Cerebus' heart, and a growing sense of acceptance helped the Derricks drift off to sleep within their mother's womb. The changes continued, the divided human soul reforming into canine spirits, Cerebrus' magical nature and Hebe's magic adapting the nine Derricks into three, then joining each trio back together as separate but equal partners with one body. When they were reborn, the Derricks would find this divided existence normal,. But for now, they would simply sleep and finish transformation into Cerebus puppies.