Princess - After your next flight with him (and only if you feel that you can) let him know that you are uncomfortable with what he is doing. Don't say it in front of everyone, just make sure there is someone around to help if you need it. If he makes out that he doesn't feel like he is doing anything wrong and doesn't listen to you then you'll have to make a complaint to your manager. You may not be the only crew member who he is doing this to. Just because you are a junior it doesn't mean you have to put up with this. Also this guy is abusing his position of Purser.
I hope that the situation gets sorted quickly for your sake, there is nothing was than dreading to come to work because you are worried you might be flying with him.
