Hi Becci! They’re beautiful! Not quite sure on the breed.
As for bonding, please keep them separate at all times. Bunnies don’t recognize family units, and any chasing and mounting at this point is considered aggressive and hormonal, not a dominance display. Eventually one may turn and not enjoy being mounted and chased. You can’t keep an eye on them 24/7, and all hormonal bunnies want to do is fight and mate. It would be a shame to have one get injured while you weren’t able to watch. And yes, it can happen in the blink of any eye. One minute things are great and the next they are ready to kill each other. This advice is also for the future duo you bring home in a little bit, they will need to be separated from each other and from the other two as well. So you’ll need 4 separate enclosures and 4 separate play times with no interaction between any of them until you’re ready to bond them.
From experience, I can tell you bunnies that fight are terrifying. I didn’t know about proper bonding and had my boys (brothers) living together as well. Bombur was a chaser and a mounter and one day Asriel had enough and the fur was flying and the blood was spilling. Some bunnies on this forum have had ears missing a chunk or testicles bitten or noses bitten, all because they weren’t separated and the owners believed everything would be fine keeping them together.
The proper bonding process begins by having all unfixed bunnies separated, then getting fixed, spend 2 months prebonding (one while they heal and an extra month to really make sure they will be successful during their introduction). After prebonding, begin short sessions in neutral territory and increase as they get along.
Bonding a quad is a whole different beast from bonding a pair, and you really will have to prepare yourself that you might have 2 pairs, a trio and a solo, or even 4 separate buns. There’s really no guarantees.
I really can’t stress it enough to have them separate, especially before something does happen, and keeping them separate after their neuters. After a neuter a bunny can go through a bit of an up and down period known as a post neuter craze. During this period its very likely one or both will not take too kindly to the other.
welcome 