@ImperfectlyInfinite Hi!:) My pleasure! Well, I was a heavy SasuSaku shipper since 2008, and maybe my obsession with this pair decreased because I might have looking for something else in a relationship than in the earlier years. And since Itachi's character is more nuanced, and the reasons of his motives are harder to puzzle out, but when you find the reason, it's most likely a selfless act, with so much devotion. And I find it fascinating! I've read many ItaSaku fanfiction in the past one year, on wattpad and fanfiction.net as well. If you are interested, I can give you some link in pm!
Have a nice day!