Monty’s litter tray habits have gone down the pan (excuse the pun) recently. I suspect it’s do with Bea, who we are bonding him with, although weirdly, he was fine for the first couple of weeks we had her. She had a little accident when I was playing with them on the bed one day. We washed all the sheets (luckily it didn’t go through to the mattress), but ever since, Monty has been pooping and peeing all over my bed nearly every day. 
I don’t really know what to do about it, since he doesn’t have a cage any more and has free reign of my room. There’s nowhere else in the house I can put him right now, either, since I’m living with my parents at the moment. I REALLY hope it’s just territorial things to do with Bea and when they’re properly bonded it won’t happen. I also wonder if it’s to do with her maturing as she was a baby when I got her so maybe he didn’t get the same signals before hormone-wise. So hopefully it might stop when when she’s neutered? Except that she won’t be ready to be neutered for a little while yet 
Anyone had any experience of this?