If you insist it's not an AV film and if it's not his private film to keep for himself. It may be his technigue to bring the best out of Sakura because you mentioned that he's famous on sex scene.Holding your ex hand's while she's simulated getting fucked by another guy and demanding to record it (which is not even your job) doesn't look good
We also don't know the storyline of the film so we know nothing. But if Shinobu is a genius director, he'll use his special technigues for a long time and is the secret of his success.
OMG, it's an extremely open ending. LOL