In 2x03 (The Dark Knight), you can kinda hear what Chuck is saying in Blair's ear, before the blackout...does anyone know what he says??

Well kind of, Chuck is asking Blair how Marcus is in bed. Then after that he keeps asking her how he makes love to her, and what does he do to her. Then they block it out a little, while Chuck kisses her neck. And then you can hear Chuck say to Blair, have sex with me. They do block out quite a bit of it though, that was the plan. Hope this has helped.

he says "i want you baby, why won't you come to me?". then he says "have sex with me."

He says "Have sex with me"

He whispers "I want you, won't you come to me?".