A 26-year-old woman charged with murdering Perth teenager Aaron Pajich cut and choked her former lesbian lover as part of sado-masochistic sex play, a Perth court has heard.
Jemma Lilley and Trudi Lenon, 43, are on trial in the Supreme Court of Western Australia accused of murdering the 18-year-old and burying him underneath a freshly laid concrete slab in their backyard on June 13, 2016.
![Aaron Pajich's body was found in the backyard of an Orelia home in June 2016.](http://web.archive.org./web/20171021133842im_/https://www.fairfaxstatic.com.au/content/dam/images/g/y/t/o/z/0/image.related.articleLeadwide.620x349.gz4iuv.png/1508401227534.jpg)
Witness Kim Michelle Taylor told jury on Thursday that she had known Ms Lilley well for many years but had ceased contact with her about one month before the murder.
The pair had previously exchanged explicit messages about sado-masochism, with Ms Taylor once allowing Ms Lilley to cut her lightly with a decorative knife and choke her during sex acts, she said.
Ms Taylor also confirmed Ms Lilley had been married to a now-deceased man named Gordon, who she referred to as "Gacy" after the notorious American serial killer and rapist John Wayne Gacy.
"It was just a nickname," Ms Taylor said.
She said the texts also heavily featured comments from the Dexter TV show, which is about a fictional serial killer.
The court later heard testimony from Ms Lenon's 22-year-old son Jacob, who said his mother was interested in horror films.
![Jemma Lilley, left, and Trudi Lenon have pleaded not guilty to the murder of 18-year-old Aaron Pajich.](http://web.archive.org./web/20171021133842im_/https://www.fairfaxstatic.com.au/content/dam/images/g/p/q/8/6/z/image.related.articleLeadwide.620x349.gz4iuv.png/1508401227534.jpg)
He was asked if she liked horses, given a riding crop was found in her bedroom, but he said no.
It emerged on the first day of the trial, which is now into its third week, that Ms Lenon was for many years a submissive participant in the bondage, discipline and sado-masochism scene, and the "Corvina" character she assumed had been awakened by Ms Lilley.
Ms Lenon told detectives the pair didn't have a sexual relationship.
A text message from her to Ms Lilley that was read out in a video-recorded police interview played on Wednesday read: "I am fortunate to have met my true dominant counterpart because without you, I would continue to feel shame.
"... even writing this is highly erotic.
"You allow me to explore Corvina and I actually really like her.
"So for all of this I say thank you."
The state alleges the pair targeted and lured Mr Pajich, who had Asperger's syndrome, to their home on June 13, 2016, before stabbing him to death and concealing his body in a makeshift gravesite in their backyard.
CCTV footage from the house showed Mr Pajuch entering the property with the two women shorted before his alleged murder.
Ms Lilley admits she was at the house the day of the murder but has denied being involved in Mr Pajich's death. She claimed she was unaware he was buried in the backyard.
Ms Lenon however admits witnessing the murder but claims Mr Pajich died at the hands of Ms Lilley.
She admitted helping clean up the scene and burying him, and pleaded guilty to the lesser charge of accessory after the fact to murder, which state prosecutors reject.
- AAP