Did Sebastian from Kuroshitsuji really have with that nun?

I've watched the entire 1st season of Kuroshitsuji like 3 times and when I get to the episode i thinks its ep 17 I wonder does Sebastian REALLY have with the nun I think her name is Madge, anywho I wonder do they have or does Sebastian do something else to her? Oh and he says that he's already put his mark on her to Angela so I don't know what that means either, so I hope its not what I think it is.