Can you recommend some popular 'theory of love bl novels'?

A great 'theory of love bl novel' is 'Love Stage!!'. It tells the story of an otaku who is suddenly cast opposite a famous actor in a project, and they end up having feelings for each other. There's also 'Junjou Romantica'. It focuses on three different couples and their love stories. Each couple has their own dynamic and the novel explores different aspects of love between men in these relationships.

I would suggest 'Cherry Magic! Thirty Years of Virginity Can Make You a Wizard?!'. This novel has a unique concept where the main character gains the ability to read minds after turning 30 while still being a virgin. His relationship with his colleague is really interesting to follow as they navigate their feelings. And then there's 'No. 6'. It's a more complex 'theory of love bl novel' set in a dystopian world where the relationship between the two main characters is crucial in their fight against the system.

One popular 'theory of love bl novel' is 'Given'. It beautifully portrays the relationship between the two male protagonists. The story delves deep into their emotions, their musical journey together, and how they come to terms with their feelings for each other. Another one could be 'Sasaki and Miyano'. It shows the budding relationship between a delinquent - like Sasaki and the shy Miyano, with a lot of cute and heart - warming moments.