Update : I took the mirror out of Sebastian's cage because I think he was becoming too fixated on it. Sweet baby Sunny, the budgie I got so he wouldn't be alone in the bird room, chirps at him, but mostly at me. She has a big home right next to his massive one. And mostly Sebastian attends to me or my husband in the room rather than her.
The good news, I feel I gave her a good home. Sunny was in a local pet store. She seems very happy. She loves the music we play for her and tolerates Sebastian 's squawking. It was hard for me to have him in a room by himself. Still waiting to hear about Matto's babies. But I don't like for anyone to be alone and I had another big cage...but I had forgotten how little budgies are!