My initial thought is “he is comfortable and marking because he is now letting them know he rules the roost”…When Coco had her urine phase, 3 times a day was pretty par for the course – she would only pee on my husbands side…or his pillow. I had to scrub the mattress with baking soda and vinegar to make sure there was no urine smell. I have found that if rabbits can smell their own urine markings — even a tiny bit, it encourages them to re-mark there.

Because your bed smells most strongly of you/boyfriend, his natural urge is to cover those smells, because he is Top Bun. You may have to go to a Plastic shower curtain over your bed during the day to ease up on the urine marking.

I couldn’t see it on your profile, but is he neutered? That may be urging on his need to mark as well.

As to pens – have you looked at the Make your Own types of pens many of us use to block off areas? NIC cubes?

He can’t pee on the bed if he’s not allowed on it. Simply make that impossible. A shower curtain works great (it’s sliippery and yucky and they will jump right off of it, plus this will keep pee off your bed if they do get up there) and you can also block the bed off with cubes if you want to. Behaviorally you can pick him up everytime he gets on the bed and put him where he should be (blocking and redirecting)

It’s important to
1) Show them what they are not supposed to do; by NOT allowing it
2) GIVE them something they SHOULD do-to displace the unwanted behavior.

I totally would NOT put pee pads on the bed-your just teaching your bunny your bed is a toilet and THAT is not going to be fun

I like the x pen idea-and then you ONLY let him out when you can watch and pluck that pee-bum off your bed if he happens to toodle up there (always pluck him right off and put him close/on something he can/should be on-ie. pick him off the bed and show him a grass matt/tunne/toy/treat/phone book/toilet paper roll/towel etc.
Don’t just tell him No-you can’t be on the bed. Tell him, get off the bed-and do this funner thing instead.

But you’ve given him access to all these things, he has chosen to play with them. So don’t feel too badly. Maybe he’s just laid back and content with just spending time with you.

Do be careful that he doesn’t start to pee on the bed to gain your attention. If you plan to continue to allow him up there with you, provide a litter box up there and reward him when he uses it. If he pees on the bed take care with your reaction. Obviously go about cleaning it up but don’t give him any attention – even to scold.

I think either a shower curtain over the bed or use bed risers to elevate it might help. If you do go ahead and get a pen, do use it for his exercise time if his litter habits deteriorate. It’s best to limit their space and they can regain it once the litter habit improves. (Man, I feel like a hypocrite advising all this! I give mine too much space when they’re bad with litter habits!)

Sorry I had meant “chosen not to play with them.”

I know the confining can “feel” cruel to the human, but it is boundary defining to the bunny. Being caged worked wonders on my Pee’er and Coco is MUCH better again. But I felt rotten caging her for the two weeks it took until she finally gave in and agreed that Litterboxes were for pee.

She knew, of course. She just wanted to make sure that I agreed.

Animals ( And Toddlers) need to know what is allowable. If they do it ( even one time) and get away with it, it gets checked off as “Allowable”. To get that back into “Not Allowed” takes 3 times the amount of time and effort than the initial prevention.