This is easily one of my favorite movies that centered around gay characters. Without going into the synopsis too much, I'd rather say about how I feel about this movie.
It's a masterpiece in itself. Even though this is a sequel of some sort to a short film but this movie could very well be a standalone film by itself. And the ending, which is after end credits had rolled deserved to have another follow-up.
As for the movie, I'd say it played on so many levels. But the main important things to take note are knowing about who you are and how you fit in this rather oppressed world where being gay is concerned. That is the major symbolism of the cave. How could you survive in such desperate scenarios in which the world throws at you. And another thing is about overcoming prejudices of others and making presumptions of others. In other words, do not judge a book by its cover.
In terms of the two leads being caiught in the cave, there were several intense moments. And I admit that despite the unusual relationship between the teacher and student I do want them to have some intimate moments; which there were yet those moments were given tasteful treatments. Their performance were excellent and their chemistry was organic. You vouch for them. At the same time, as the movie progressed while they were trapped in the cave it did feel as if all hopes were lost. And with every such moments presented itself I feel morbidly ok about it. They found hope and strength in each orher.
Ultimately, if the cave represents the oppressed world for whom we love then the titular butterfiles represent hope.