Patti Davis, the author and daughter of President Ronald Reagan, came forward on Friday with an account about being sexually assaulted decades ago, adding her voice to those of women defending Christine Blasey Ford.

In an opinion piece in The Washington Post, Ms. Davis said she was at a prominent music executive’s office about 40 years ago when he crossed the room and forced himself on top of her “so quickly” that she froze.

“I lay there as he pushed himself inside me,” Ms. Davis wrote. “The leather couch stuck to my skin, made noises beneath me. His breath smelled like coffee and stale bread. He didn’t use a condom.”

Ms. Davis, 65, is a writer and speaker whose latest novel, “The Earth Breaks in Colors,” was published in 2015. Her opinion piece in The Post, which did not name an assailant, came five days after Dr. Blasey, 51, came forward as the woman who had accused Judge Brett M. Kavanaugh, a Supreme Court nominee, of sexually assaulting her when they were teenagers. Judge Kavanaugh has denied the allegation.