Well, I got some new information: she confessed, that she had had too much alcohol and that she had passed out at some point. And when she woke up, David was already "doing her". She told me that she didn't even understand where she was at first. And when she did, and when she understood what was going on, Marietta "woke up" and left. So David didn't "finish" and well, neither did Marietta.