Well, 'bnha' is short for 'Boku no Hero Academia'. Fanfic means fan - made fiction. However, the term 'cocksleeve' makes this seem like it could be something inappropriate or not in line with the general positive and family - friendly nature of the 'My Hero Academia' fandom. It might be some sort of very niche, and perhaps not so appropriate, fan - created story within the BNHA community.
I'm not entirely sure as I haven't read this specific fanfic. But generally, a 'fanfic' about 'Harry' (presumably from the Harry Potter universe) with a 'fem' (female) character might involve a unique interpretation of the story, perhaps with a female - centered perspective on the events in the wizarding world.
No. Given the rather inappropriate connotation of the term 'cocksleeve', it's hard to imagine there could be any positive aspects. 'BNHA' is a great series with a lot of positive values, and fanfics should generally uphold those values.
Searching for fanfic on legitimate fanfiction platforms is a good start. Websites like Archive of Our Own (AO3) might have it if it's compliant with their content policies.
Rather than focusing on this type of fanfic, you could look for more positive and mainstream Izuku fanfics that focus on his hero journey, friendships, and growth. For example, there are many fanfics that explore Izuku's training with All Might and how he overcomes challenges in the hero academy.
Some cartoons show sad people to explore deeper emotions and teach us about dealing with tough times. It can also add more depth to the story and characters.
You can start by sketching the basic outline of the rams, paying attention to their shape and features. Then add details like the fur texture and expressions.