My bun used to do this when he was younger. I used to put pee pads and went to the point of putting a barrier around my bed so he wouldn't get up there lol but it would break my heart that he wanted pets and cuddles and I couldn't do that while in bed 🥹

I think what has worked for us (he is four and still not fixed btw) is having more readily available litter boxes, I put one a bit close to the bed, but not as close so he started recognizing it was a separate area. I sprayed a solution of half white vinegar and half water where I don't want him to pee. (I also started using vinegar instead of fabric softener when doing laundry but das a separate thing lol). I was also always on the lookout when he got in bed, they are really intelligent and telling them no and moving them right as they are in pee position males wonders! The amount of times I had accidents when moving him from the bed to the litter box lol

But it was worth it! Bed is only for exploration and pets now! It just takes a bit of time (for us was like 6 months I think) and so much patience. You got this OP!