I am so sorry to hear the sad news about Luke. Such a sweet & beautiful boy. I remember in one of your videos how sweet & patient
Luke was with Sissy trying to playing with him.

I lost my kitty Punky to FIP two years ago. It came on so suddenly & he couldn't recover. I still miss him very much. I hope Luke can be made comfortable as possible
and doesn't suffer. Prayers for you & your furry gang.