That is certainly a bit... leading, yeah, and Ryoji does pick up on it. He's not entirely sure how much he agrees, but it does seem like Tobias at least knows something. Clearly not a Sin-Eater, though. So what is he?

The offer gets Ryoji to smile and nod. That will at least give them both the opportunity to feel each other out a bit more, and provides Ryoji the excuse for being there. "Yeah, that would be great, if you're up for it!"