[He does wonder if it is indeed a once-over for about half a second, starts contemplating how to respond - there's no sense in defaulting to outright rejection despite his complete lack of interest. What she says next clear things up, of course. He inclines his head, less humbly and more as acknowledgement of her words.]
What kind of butler would I be if I did not dare to brave a storm? Most of the firewood I've gathered comes from the park, as a matter of fact, [if things go back to normal and there are barely any trees left besides the big sakura tree, it will be Sebastian's fault] but it's true I have supplemented with conifers from the edges of the forest. [Mostly because he wanted to try make tea with the shoots tbh.]
Truthfully I wouldn't call going out alone such a big feat, comparatively speaking. You have heard, certainly, how skittish the snow creatures are? They act rather like cornered wild animals. If one is cautious it isn't impossible to avoid encounters with them altogether... well, or so the case has been earlier in the week. [They're getting progressively more aggressive and intrusive, after all, but he really has been outside a few times without running into them.
From anyone else this would sound like an attempt to cover their traces and lead her off track, but he delivers that entire speech with such calmness. Implications are just not the way to make him talk, sorry. Babble on about his work, however...]