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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
Left the bunnies overnight again and only checked on them twice lol and then we’ve had them at home unsupervised for around 6 hours today and they were absolutely fine 
Peanut still thinks about humping Buttercup, and does appear to make an attempt but Buttercup hops out of the way and after a few tries, he gives up lol. And I can confirm that Peanut is very paws-on when he thinks Buttercup is in the way, he digs a little which is better than nipping I guess!