First, understand the character's motivations and psychology. That'll give you a better grasp of the story. Then, focus on creating a balance between the intense emotions and a coherent plot.
The first yaoi comic is a bit hard to pinpoint exactly as it depends on various factors and definitions. But some early examples include works from Japan in the 1970s.
Yaoi furry comics can vary a lot. Some might have complex storylines that explore the characters' inner conflicts and growth in their relationship. The art can range from cute and cartoony to highly detailed and realistic. Also, they might incorporate fantasy or sci-fi elements to add more depth.
Yaoi cartoon comics typically have a lot of emphasis on the emotional journey of the male characters. They can have elements of drama, passion, and sometimes fantasy. The illustrations are often done in a way to make the characters look attractive and engaging.