She ended sleeping with him and true to his word he got her the full time position. About a month later I found out about the whole thing and broke up with her.
I submitted the transcripts of their conversations to HR. They conducted an investigation and he admitted to everything. The guy got to keep his job. They transferred him to another group and wanted her to sign a statement saying that nothing improper happened. They strongly suggested that her full time offer might be rescinded is she didn't sign the statement.
She signed and has been working there the past 6 months.