If Kaori died giving birth to Yuji, how did Kenjaku twiddle with fetus Yuji?

[IceBomb]

 

[Yoho]

Kenjaku fiddled while he was in the womb

Kaiori gave birth to Yuji

Kaiori dies from complications

Or Kaiori dies before giving birth but Kenjaku takes over the body in order to deliver Yuji

 

[NikaInParis]

It's not said she died giving birth to Yuji? Just that she died before they could have a child

 

[Roo]

She died before she had Yuji, Yuji’s dad fucked Kenjaku who was in her body and had Yuji