Sasori wasn't easily surprised, he wasn't that surprised when he ended up in the akatsuki's old base after he died, he wasn't surprised when he found out that he was human.
He however WAS surprised that when he entered the base he was met with his leaders-pearcing-les face smiling right at him, not to mention that his eyes were accualy brown and NOT the usual purple that he was used to.
So that brings us to where we are now, 'leader-sama' smiling, and sasori looking like he was going to pass out any second.
"I assume that you wonder what's going on, Right!!!" 'Pein' explained after a few seconds of just staring at each other.
Sasori gave him a 'no duh' look.
"Well too bad, I need to wait for the others to die so that I can explain to you all because I do not want to say the story over and over again!" He exclaimed.
Sasori new one thing, this was going to be a loooooooong wait.