Killing Stalking exists in both manga and anime forms. The manga provided the basis for the anime adaptation. However, both have their unique characteristics and might appeal differently to viewers depending on their preferences.
You might be able to find it on some dedicated manga reading platforms or websites. But be aware that some sources might not be legal or of good quality.
You could try looking on manga subscription services or even some fan-run manga forums. But remember, reading manga from unauthorized sources is illegal and not recommended. Always look for legitimate ways to enjoy 'Killing Stalking' if you can.
Popularity of 'Killing Stalking' lemon fanfictions is likely to be relatively low. The nature of the original work is already quite extreme and controversial. Many fans would rather engage with fanfictions that add depth to the story, such as exploring the backstories of the characters or alternative endings. Moreover, the idea of 'lemon' fanfictions can be off - putting to a large number of people, so it's not likely to be a mainstream part of the 'Killing Stalking' fanfiction community.
It's a dark and disturbing story. It involves themes of abuse, psychological trauma, and a very complex and twisted relationship between the two main characters. It's not for the faint - hearted.