Hi everyone!

I have had my little Wesley for about 5 years and Sophia for 3, they are very close, both spayed/neutered. Wesley is very needy, always wanting cuddles and pushing to sleep next to me on the bed where as Sophia is more independent although she does enjoy cuddling with her brother.

I have recently adopted a bun from a friend who was to be without a home. Stewie, this new bun, has already had a couple playdates with my two. Everything was fine at first, until Stewie started showing dominance against Wesley and humped him. Wesley, a very very docile bun, did nothing to retalliate. Stewie occasionally will chase Sophia for attention, whom runs away. 

I currently have my two buns in their cage, door closed, although it is usually left open so they may run around. Stewie is in an opposite cage until he can be neutered ASAP. He is a sweet boy, loves to cuddle and run around, sleep at the foot of the bed and gives tons of bunny kisses. He has more energy than my other two but he is a baby after all. I am only worried that he may try to fight my Wesley or hump/show aggression.

Any tips on bonding three rabbits, two boys and one girl when Wesley and Soph have already been bonded for a couple years? I appreciate the help