Responses
If they're asking for suggestions go for it! Although maybe you could suggest it in a way like "have you ever thought of writing a BL story" rather than "can you write a BL story" because the latter lowkey gives off the feeling of being unsatisfied with their straight manga.
Though if the creator says nothing about suggestions/doesn't have a question box, it would be kind of rude to leave it as a comment under an unrelated post.
Hey Guys! I have plans to ask if a creator of a straight manga would have plans to make BL manga/Manhwa’s in the future. What is your opinions on it? Because I feel like, I should ask for what I want, so I won’t regret it later on. But I’m really indecisive. ╥﹏╥