My big boy named Tubby was my nap cat. He would nuzzle into my armpit and we would power nap all afternoon, and we were joined by my 3 legged cat, Missy, on my lap.
Tubby is gone now but Missy is still with me.
I had a Missy once. She was with me for 19 years. She insisted on being in my lap all the time, and slept on my pillow so she could curl around my head. Black and white, half Siamese, very vocal.
She is waiting at the Rainbow Bridge, I am sure. Just like your Tubby.