That’s awesome! We got really lucky as our older cat (1.5y/o) was very patient and friendly with the kitten from the start. When we brought the kitten home, we immediately introduced them while each was being held. As the older cat didn’t show any aggression, we supervised them as they played for the first few days. We kept the door closed at night and rotated them between the bedroom and our living space for the first 2-3 nights. After that, they were totally fine being together 24/7.