Sexy! This was the episode that Наруто was telling him that no matter what, Sasuke would always be his best friend blah blah blah but personally I think Наруто was "confessing"! And then they had a flashback and this was one of the pictures! Anyway...
I have so many favourite expressions from Sasuke, but this subtle smile of his is probably the best <3 I also Любовь the Болталка expressions he makes (pre shippuden) when he goes out of character xD