There are several options. Some dedicated manga reading apps like Manga Rock or ComiXology could have what you're looking for. Also, some websites specifically focused on BL content might have a good selection.
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.
The 'unintentional' aspect makes it special. In many love stories, the characters actively pursue love, but here it might be more of a gradual discovery of feelings that they didn't initially expect. This gives a more natural and unexpected feel to the relationship development.
You could look on platforms such as Comico or Lezhin Comics. They often have a decent selection of BL manga. Just be aware that some content might be restricted based on your region.
You could try looking on some fan-run forums or blogs dedicated to BL manga. But keep in mind that not all of the content might be authorized and could have copyright issues.