Slight recoil from the mirrored action-- which Alatus does not blame their lord for, now realizing that it must have been rude of them to do so in the first place.
But the decorated spot is rather tender. "Nnh--" Even more now that it is poked a second time.
"This is a báiháo, my lord," they mumble politely, curious of the fact that Lord Retuo isn't yet familiar with the imagery. They pause for some seconds to gather their thoughts of what little information they remember from their past. "It represents... a third eye, and my existence as an illuminated beast and role as adeptus."
Plenty of details on their false human disguise are mere embellishments, either recommended to Alatus by trusted figures or they are simply details they've ended up copying from the humanoid disguises of those dearest to the illuminated avian. Their báiháo, gradient-marked limbs, and the permanent crimson lines framing their eyes existed on their beast form, and there was no harm in bringing them over onto their human façade.
But in their mind, the forehead marking is more than just decoration. Which is why they initially thought that Lord Retuo's markings might have similar purposes.
"... So your chest markings do not represent some sort of powerful ability?"