[At the very least, how he accepts the words easily and with that smile is enough to reassure Shiro. That least, he knows, is solid-- that no matter what, it's Keith and he can trust him with anything a thousand times over. The hand brushing at his hair lingers for perhaps a moment too long before dropping down to rest, naturally, at his shoulder.]
And nothing will ever change that. For either of us. [That much he knows, knows that Keith would feel the same way. What happened earlier-- maybe they should talk about it, and perhaps this is his way to approach that topic, if Keith wants to talk about it. But he also knows this much: whatever happened, it doesn't mean anything between them is ruined.]