Pet Care Needed

They have automatic feeders and gravity water containers, I really just don't like leaving them alone for too long. I can be gone up to 15 hrs a day, I would like someone to play with them and keep them company. There are 2 cats black and white , one is a long hair who is 12lbs the other is a short hair that is about 20lbs. They are very sweet and sometimes shy until they get to know people. I play with them as much as I can but it's hard with how much I work.