[Yes, well. As much as Sebastian fancies himself a mystery wrapped in an enigma most of the time... No, there's the occasional tell. He smiles at her, appreciatively - inconvenience or not, he likes an attentive human. A nod: there is something, yes.]
I'm running an errand. ["In the forest" he doesn't specify. She understood that much already.] In this weather especially it might be a bit rough going.
["Still up for it?" He'll have to hold back if he's not going solo, but it's not like he has high hopes of finding anything relevant. The forests, with all their mystery, might after all just be a smokescreen, although he still likes to investigate them when changes happen in the world.]