Well, without more details about 'The First Commandment BL Novel', it's a bit hard to give exact similar ones. However, 'Yuri!!! on Ice' (although it's more of an anime with strong BL undertones) inspired a lot of BL - like fanfiction. Also, 'No. 6' is a great dystopian BL - ish story that might be of interest if you like complex world - building and relationships.
One similar BL novel could be 'Love by Chance'. It also has a complex relationship web among the characters and explores themes of young love and self - discovery.
Yes, I am. Chinese BL novels often have unique storylines and character relationships that are very appealing. The cultural background and writing styles add a special charm.
Well, I am addicted. The beautiful art, diverse plotlines, and the exploration of emotions in BL manga make it hard for me to resist. Also, it offers a unique perspective on relationships that I find fascinating.
One similar BL novel could be 'Given'. It has a great story about music and the relationship between the main characters that develops in a very heartwarming way.