At the mention of Ruby, Ben's expression arranged itself into the beginning of a full-on grump, but it was derailed by what Sam actually said, as Ben had simply jumped to this being so kind of defense of Ruby, not his uncle actually asking him if he wanted to talk. This was good, right? Still, there was something that kept Ben reserved, that gave the one-eyebrow-arched look on his face a definite skeptical bent to it.
"Are you just gonna lie about it if I do, like you always do?"
Despite the severity of the question, it was delivered more neutrally than resentfully, because Ben was keeping in mind he had a mission. A mission from an angel, no less, to help his uncle keep remembering he was human. But he wasn't going to keep talking if Sam was just going to clam up about it the minute he said 'sex'. They could just go get candy and do something normal and human without talking.