Right now the both of you are only FRIENDS.
Maintain at Friendship mode during the movie outing. If you feel
like calling up your junior to join, then call. If you don't feel
like it, don't call. Simple as that. Even if he sees you 2 going
for movie, so? Just tell him both of you are ordinary friends. Not
very difficult I suppose.
Remember, both of you are watching the movie as FRIENDS
