Fanfiction.net also has a good collection of Shisui crossover fanfictions. There are many dedicated Naruto fans who write interesting crossovers here. However, the search functionality might not be as advanced as AO3, but with some patience, you can find some real gems.
Wattpad is another platform that may have Shisui crossover fanfictions. While it has a more general focus, there are Naruto fanfic writers on there. You might have to dig a bit deeper compared to AO3, but it can be a source of unique and creative Shisui crossover stories.
Another one is 'Shisui's Crossover Quest'. This fanfic is more about Shisui being sent on a quest in a different dimension. He meets all kinds of strange creatures and characters. The story does a great job of exploring his character as he faces challenges that are completely different from what he's used to in his own ninja world.
One great Shisui Uchiha fanfiction is 'The Legacy of Shisui'. It delves deep into his backstory and how his actions could have had different implications on the Uchiha clan. Another is 'Shisui's Redemption', which focuses on his character growth after some of the more tragic events in his life. And 'Shisui's Unseen Journey' is also interesting as it takes you on an adventure with Shisui that was not explored in the original story.
I'm not really into that kind of fanfiction. But you can try searching on some well - known fanfiction websites like Archive of Our Own. They usually have a wide variety of fanfictions about Shisui Uchiha and you might be able to find the ones you like there.
Rather than seeking 'lemon' fanfiction, it would be better to explore fanfictions that develop the relationship between Sakura and Shisui in a more positive and appropriate manner. You could try searching for fanfictions that explore their friendship, or how they might interact in different scenarios within the Naruto universe. This way, you can enjoy stories that are more in line with the general spirit of the original work.
There's 'Shadows of Friendship' which is a really interesting piece. It shows how Shisui's death affected Itachi in ways that are not often explored in the main canon. It's a bit of a heart - wrenching read but very well - done.
One popular Shisui time travel fanfiction is 'Shisui's Second Chance'. In this fic, Shisui travels back in time and tries to change the fate of his clan. It has an interesting plot that keeps readers engaged.
One common theme is identity. Since he's in a different world or with different characters, Shisui often has to re - evaluate who he is. For example, in crossovers with modern settings, he might question his ninja values in a world without the same kind of warfare.
Finding good 'Shisui x Itachi' lemon fanfiction can be a bit tricky. Some people might write it in a more tasteful way while others might not. One way to start is by looking at fanfiction communities dedicated to the Naruto fandom. However, be aware that lemon or explicit fanfiction might not be suitable for all audiences. You may also want to check reviews or ratings if available to get an idea of the quality before reading.
Archive of Our Own (AO3) is also great. It has a very user - friendly interface and a tagging system that allows for precise searches. You can find some really creative and well - written Twilight James fanfiction there, with various interpretations of his character.
Wattpad is a great platform to look for jayfeather lemon fanfiction. It has a large community of writers and readers, so you're likely to find a variety of stories with different takes on the characters.