Don't forget scent swapping! Lots of scent swapping. After your girls have had their 30 day quarantine, start switching the pouches from one cage to another. Don't wash them if you can help it. You can also use little fleece squares inside their pouches and swap those every few days. The point is to get them used to each other's smell, and to mingle the scents so when they meet they smell familiar. After a week or two, or maybe even three of scent swapping you can intro one sister to Twixy in a neutral location like a bath tub. Do it in the morning when they're tired. Have a new, clean pouch ready for them. Also have a towel handy in case they fight so you can pull them apart and protect your hands. If they get along they should go into the pouch together to sleep. Let them sleep together for the day, and play for the night, but stay close just in case they fight because you will need to separate them. Then do the next sister with Twixy the next day if it all works out. good luck!