bonding process for new rats

In August I adopted two five month old nuetered male rats, named Obi and Ronny to be the companions of my year old females, Sookie and Bear. I've been very busy and haven't had as much time as I'd like to bond with the new rats, and I'm not entirely sure how best to do that. If anyone has advice...

Hello, I just got a pair of females they are about 6-7 inches long so almost full grown. One was surrendered with 12 babies that have been weaned and she is somewhat skittish but the other is very curious and will take food directly from you hand and only exhibits occasional shyness (which is...