In the case where I try to play the video, the game can't proceed past that point, it just stays on a black screen. So unfortunately, that route is effectively blocked for me on Linux.
It's okay, though. I'll probably try the Windows version through Proton at some point to see if the video plays correctly there. I'd like to see how the content changes when the Lust points are higher, since skipping the video lowers the Lust points.
For now, though, I'm going to take a break from it rather than keep troubleshooting. :) Thank you for taking the time to help me debug it and for all the suggestions. I appreciate it.