[He does indeed, since he has the ability to glance Sans's way while looking at the saved image of the pie simultaneously. If he wasn't already sure of what that powder was, that grin would give it away.]
Of course you did. Why did I suspect anything else! [His voice is fondly exasperated. This is exactly the kind of nonsense his brother hadn't gotten up to during that rather forced baking spree, which just helps ground the whole situation into what it should have been back then. He's not robot enough to mute his own voice - thankfully? or yet? - so he settles for ducking his head and trying to muffle the sound of the snickering coming out of him.]
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Of course you did. Why did I suspect anything else! [His voice is fondly exasperated. This is exactly the kind of nonsense his brother hadn't gotten up to during that rather forced baking spree, which just helps ground the whole situation into what it should have been back then. He's not robot enough to mute his own voice - thankfully? or yet? - so he settles for ducking his head and trying to muffle the sound of the snickering coming out of him.]