Sea of Silence is a great sequel, it has many heavy themes and it refuses to shy away from any of it, which makes it for a difficult to bear with, but beautiful representation of many queer issues. It's a beautiful story filled with suffering and real pain in it's issues but it is absolutely special.
I wasn't sure where a sequel could go, but I think it elevates A Quiet Universe really well and drives home the points and narrative made in the first one. Awesome read.