I was actually really worried that there would be problems... We weren't planning on having four cats (not that I think there's anything wrong with it once they're all well taken care of and healthy, etc). We adopted the two bengals (a male and female) and shortly after, our breeder whom we got Jake from (who passed on with FIP) contacted us to let us know she had a little girl she was holding. She wanted to wait until she was spayed and certain she was completely healthy before telling us - she wanted to replace Jake for us. She really has been wonderful to us and her cats are so well socialized and we had loved Jake's personality/temperament so much that we knew one day, we wanted to get another Havana Brown. We just didn't realize it would be so soon! But anyway, since the bengals were coming in as young kittens and the new HB (female) would be a young kitten, it seemed the safest time to introduce them all, in hopes that they would bond.
Sure enough, after less than a day of hissing and eyeballing each other, they have all bonded and absolutely adore one another!! They groom each other, sleep in warm, fuzzy little piles and play all the time. We've had no problems with the litter boxes or marking or anyone being afraid of the other. It's a relief. I was worried we had taken too big a risk. A breeder who socializes their kittens well makes a huge difference in their temperaments! They have an awesome dynamic.