Black cat with white moustache, who are you?

Does anyone know this cat?

He(?)'s been visiting my indoor cat behind the window since late January / early February nearly every day between Hewitt Road and Allison Road. He's also been trying to come inside and has managed it a few times. Each time he's headed straight for my cat's food.

He seems very friendly and young, but gets spooked easily. He looks healthy, so I hope he is not a stray. Would love to know his name since he visits so often. :) He also follows around my cat if I'm with him in the garden. He is quite vocal and chirps a lot to get my cat's attention.

I haven't seen him for three days now, so I admit I'm a little worried. My cat misses his friend, too.

Would love to know more about this cat. :)