Is this rape?

My sister has been having trouble in her marriage and is basically stuck with this guy while she's looking for a place.  He knows she wants a divorce and has made her life a living hell!  Last night he wanted to have sex and she told him no. He told her he was going to go jerk off and wanted her to start him off orally.  Again, she said no.  He forced her to have oral sex and then jerked off in front of her and said seeing her like that turned him on.  In my eyes, I think that's rape because she said no multiple times.  Am I right?