Portensa never had a face and she still didn't have one still, so Gordon should have been completely used to communicating with a blank slate. However he wasn't. Gordon wasn't used to talking to an individual whose face he could not see. He didn't have a clue what her emotions were like now.
Fortunately she rescued him.
"Master, I've missed you so much."
She said and a few points of light appeared on the trunk of the tree. Glowing softly Gordon realized that Portensa was willingly showing him her emotion through the lights. For in the next moment they gathered into the approximate caricature of a face.
Right now the face was smiling.