Christie Brinkley’s estranged husband said Wednesday he had sex with his then-eighteen year old lover in his office and paid her $300,000 while hoping to keep their affair quiet. New York architect Peter Cook is fighting the 70s/80s era glamour model for custody of the couple’s two children, Jack, 13, and Sailor, 10.

A shamed Peter testified that he spent approximately $3,000 on Internet porn during his marriage.

Peter’s former mistress also took the stand on Wednesday. Diana, who was summoned to court by Brinkley’s legal team, says she had sex with her then boss in their Hamptons workplace, as well as several homes owned by Christie.

“In his office he asked me how I would feel if he told me that he was attracted to me and that’s really how it all started,” Bianchi said under oath, the New York Post reports.

“I think I was a little taken aback, but I wasn’t against it either really,” the teen said on the stand. “I wouldn’t say that one of us pushed the other. I would say that it was a mutual thing.”