Digger didn't know he was in the middle of some sort of Sin war. He was in it when he ran into Lust with Greed. Now he was in it with Sloth, but he knew not a thing about what any of them were. He couldn't pick up on the fact that he was some prize to be poked at because it was Greed's, and ultimately being selfish as they were, the Sins only destroyed best what belonged to each other.
His kisses were a bit unsure, it was weird, he couldn't deny that. It was also more weird because this would be over about as soon as they started. There wasn't a fire in the whole making out bit, but it was something.