Yes!
Scratchy was very protective of Scrappy 2 when they were Together on The Porch,and when she went to the Vets,it was discovered that Scrappy 2 was pregnant.
Sadly she was too young and her Little Kitten was stillborn.
Scratchy used to let her eat first,and did his best to keep her warm by covering her with his body.
You are right to keep an eye on them.
Please keep us informed about the Little Black Cat.