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Ohh, that could indeed come in handy now. If Sieglinde sees the twin without an eye patch she could notice that the mark in his eye is missing. And with what our Ciel said to her about not letting anyone in even if it’s him and with what Soma knows about the attack on him and Agni Sieglinde might be able to tell that there are two Ciels.
I’m not sure if she’ll suspect that there’s a contract but since this contract sign is technically the only way to tell the twins apart the knowledge about its existence may indeed be important now.