Graham Dwyer's murder trial has heard text messages in which he allegedly agreed to impregnate Elaine O'Hara as a reward if she helped him stab a woman to death.
The architect of Kerrymount Close, Foxrock denies murdering the 36-year-old childcare worker at Killakee mountain in Dublin in August 2012.
The jury is hearing further details of the almost daily contact by text message between Elaine O'Hara's iPhone and a prepaid phone.
The prosecution claims this phone was used by Dwyer as part of their BDSM relationship.
In July 2011, the man says he will punish her by raping her and leaving either deep stab wounds or marks on her neck.
She texts 'please sir i don't want you to stab me anymore, I'm scared you're going to kill me''.
He replies 'you won't die, night night'.
The jury heard the man also agreed in these texts to get Elaine O'Hara pregnant using the words 'a life for a life help me take one and I'll give you one' before outlining plans to rape and stab an estate agent in an empty house in Cabinteely.
When she asks how his plans to stab a woman are going – he replies “terrible I've tried a few dry runs – always too nervous”.
By October 2011 she says that she is sick of the status of their relationship and asks for her keys back.
He asks for a second chance, saying he would be closer to her if she didn't smoke and he would love her forever if she helped him fulfil his dream.
She agrees as long as he never stabs her again.