Any hints on how and where to buy movie? I think I've completed the pool quest line.
If you have progressed enough you should have
in the journal
The movie can be bought on the computer > browser > E-shop > the forbidden love
Once you bought it watching TV with Emilie at 21:00/9:00PM and use the conversation interaction.
Just in case I'll tell you what must be done in the pool questline.
You need to have kissed her 2 times in the scene where she is tanning in the sun lounger.
After that you need to talk to her at dinner (19:00/7:00PM)