You should not do any introductions until your new bunny is spayed and hormones have settled.
Trios are hard. It really depends on personalities. I’ve tried twice to bond a trio and once to bond a quad and have failed all three times because in each case one of the pairings just would not get along. Since you already have two males (I’m assuming they are bonded and neutered?) it would be better to introduce a female. Keep in mind that baby rabbits are very often mis-sexed.
You will need space to house all of them separately in case the bond breaks between the males while working on bonding. Also keep in mind that occasionally the original bond breaks permanently so you really need to be prepared for that possibility.
I know it’s tempting to get more rabbits (I have 4 myself), but a trio is not guaranteed to work so you need to be prepared for that possibility and be sure you are getting the bun for the right reason.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.