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Now what to do in this type of situation?

So a few days ago I recieved order in which I have to edit 5 video in a whole order.
As the buyer told me to send him each video in 2 days so when I edited my first video and then I delivered that to the buyer,Then the buyer requested a revision and he told me to sent it to his inbox because there are still 4 videos remaining.
So what I have to do now because he can cheat me when I will deliver 4 video and then there is a chance that he could cancel his order because he got his first 4 video without water mark.
So what I can do.
Please help.