[Yes, excellent idea. Let him express in full detail how displeased he is with all that is happening for the next ten seconds. As if Sebastian would have any control over it. After the initial vitriol though, he thankfully moves on.]
There must be something supernatural at force here, otherwise it wouldn't affect your senses so substantially. Though it can't have been strong enough to sever our bond. [He writes out onto Sebastian's palm, fingers light and quick, his other hand left placidly in Sebastian's grip. Sebastian wouldn't be nearly so solicitous, if that were the case.
It's unnerving not to be seen, and he's not sure whether it's relegated to Sebastian only, or if he's now rendered invisible to all. Heh, the shadow behind the throne, indeed. Either way, he's interested in testing out his theory.]
This is an Order, Sebastian. [Ciel calls out, aloud and without the assistance of palm writing. He slides his fingers under the patch of flowers on the brim of his hat, yanking them off in one smooth motion and scattering silk petals everywhere. They fall to the ground, now fully visible. His concealed eye opens to reveal the glowing sigil, though there's no doubt in Ciel's mind that Sebastian won't see it.]