Dusty Buns is exceptionally adorable!
He’s also being a perfectly normal young bun. At nearing 3 months, he’s coming into bunny adolescence, aka bun puberty. It’s great that he used to be perfectly litter trained – this means what’s going on now is due to a hormonal storm. He can’t help it and neither can you.
Your best bet is to bear with him until you can get him neutered. As a rule hormonal behaviour subsides within 1-2 weeks (during which time the the behaviors can actually intensify). For some male buns, hormonal behaviour can persist up to 8 weeks and still be within the normal range. Since he used to be litter trained before his hormones struck, chances are very good that he’ll go back to that when he nolonger has the urge to spray and mark everywhere.
Meanwhile, try to protect the couch as best you can, and just nevermind him if he lunges and/or growl at you. Dont withdraw, because that tells him his aggressive behaviour is being successful. If needed, for now, wear gardening gloves or similar when you handle him.
It’s very important that you dont back down. Animals (incl humans) operate on a trial-success basis. I currently have a young male bun, and in the beginning when he tried to challenge me, I was just like “oh really 🙄” and just got on with it – emptying litterbox, refilled water bowl etc. He caught on really quickly.