Sasori watches from the sidelines as you and Deidara converse with each other. As the conversation takes a more friendly turn, an unpleasant feeling wells up inside of the puppet master. He's so attached to you that he can't help but feel jealous of those who have your attention. Even if it's only for a second.

He knows that it's irrational to feel this way, but he doesn't care. You're Sasori's partner, and you belong to him. No one else. Damn that Deidara. If he weren't in the Akatsuki, Sasori would have killed him for this transgression.