Jeffrey Stern Made Mistress Talk Murder During Sex, New Documents Claim

July 3, 2012— -- The ex-lover of Jeffrey Stern said the Houston attorney emotionally and sexually manipulated her in order to get her to hire a hit man to kill his wife.

Stern groomed his ex-lover Michelle Gaiser, through financial dependence and kinky sex, the court documents states.

"The only way Jeffrey Stern could reach an orgasm was to have Michelle Gaiser describe how she would kill his wife," the documents stated. "Jeffrey Stern, as an emotional manipulator, was crafty in his methods of entrapping and molding Michelle to carrying out his wishes."

Gaiser has pleaded guilty to plotting with Stern to kill his wife Yvonne and is serving a 25 year prison term.

Yvonne Stern, who has reconciled with her husband, is now suing Gaiser in civil court. Gaiser's response, filed Friday, is filled with details of the kinky sex life she shared with Stern and is intended to show how Stern used sex to manipulate Gaiser.

"A steamy sex novella could not sufficiently describe the intensity of their sexual relationship," the documents stated.

The couple frequently had sex at Stern's mansion when his wife wasn't home and he made his lover wear his wife's bras and panties, Gaiser claimed.

Stern solicited male transsexual prostitutes and demanded Gaiser watch, the documents alleged.

On one occasion, a transsexual named Cindy met the couple at Moe's Steakhouse Bar where Stern allegedly "began playing with Cindy's male genitals in the view of Michelle Gaiser." During another encounter, Cindy had to run to Gaiser for protection from Stern's "painful deviant sexual advances," the documents alleged.

The alleged coercion also extended outside of the bedroom, as Gaiser became financially dependent on her lover. He persuaded Gaiser to quit her job and he opened a satellite personal injury law firm where she worked.

"At that juncture in her life, Michelle was paying her sister's college tuition at Florida State, she was supporting her mother, she was contributing to her brother's college education and she was purchasing a home. Once she went to work for Jeffrey Stern she became totally dependent on his financial support," the filing said.

Prosecutors say Stern and Gaiser planned three failed attempts to kill Stern's wife, Yvonne.

The plots failed, although Yvonne Stern was shot in the stomach during the third attempt.

Stern has admitted the affair with Gaiser, but denied any wrongdoing in the murder attempts.

Yvonne Stern initially filed for divorce after learning of her husband's infidelity, but took him back. She has said she does not believe he was responsible for the attempts on her life.

"Is this the plot of a mastermind? My husband is brilliant. He's smart. He's talented. He would never be capable of doing such a terrible job," she told ABC News.

Stern will stand trial on July 27.