Summary: Shisui, wary on all fronts.
Attention
Orochimaru is waiting for him. Soon, he is told, he will be taken away from this village with its many unnecessary restrictions. Meanwhile there's the Mangekyou.
Behind him there is always Itachi, a Jounin and soon ANBU. His eyes have developed as far as they'll go, but he feels it's not enough. As if it's natural to know.
Shisui hates this talent that needs no awakening, but he gathers the boy close and keeps him safe. He isn't sure why he does it. Sometimes he thinks that he is waiting, too, but for what? He doesn't really want to know.
END
I plan to explore this idea a bit more fully later, or possibly in a separate story, but essentially Itachi is not the first in the Uchiha clan to attract Orochimaru's interest.