Yikes. The article this morning on People only talked about the first time Mackenzie Philips had sex with her dad. So did they have sex just that one night? Did the drugs fog their minds so completely they lost all sense of who they were and what they were doing?

Um, no. No not exactly.

…in the new issue of Us Weekly, her half-sister Chynna Phillips (says Mackenzie called her one day), “And she went on to tell me that she had had an incestuous relationship with our dad for about 10 years.”

Oh and there’s more…

(Mackenzie) and her father did drugs together. She even tells Oprah Winfrey in an interview Wednesday, “My father shot me up for the first time.”

Chynna confirms to Us Weekly, “They were both doing drugs together.

“After long nights of heroin use, she’s claiming that she once woke up and that my father was on top of her having sex with her,” Chynna tells Us Weekly. “Was he actually raping her? I don’t know. Do I believe that they had an incestuous relationship and that it went on for 10 years? Yes.”

Heroin sounds like quite the aphrodisiac. No girl has ever put up with me for more than 3 years. This dude got his own daughter to blow him for 10. I’m gonna throw needles full of it at Megan Fox starting today. It’ll be romantic, I’ll be like Cupid. Except instead of shooting her in the heart with an arrow of love, I’ll shoot her in the veins with morphine soaked in charcoal and hydrochloric acid. Other than that, Cupid.