help! help! help! peeing issue

I posted about this before but the problem is still present. My cat (3 mo old male) is peeing on my bed. When he first peed, the litterbox in my room was pretty dirty. But then he peed again even when it was clean. Then, more. Now my bed reeks of pee and I am considering what my plan should be (I can't keep a cat who pees on my bed and his adoption potential is highest when younger). he has coccidia and is in otherwise good health. Nice cat overall.

I do have another cat who is slowly adjusting to the kitten and I have a feliway diffuser to lessen the tension between them.

Has anyone had this problem with their kitten (or seen it elsewhere) and had it go away? Or will this be a life-long issue? HELP!

For one thing, till you get a new matress, your bed is a target! There is no gaurantee that it would stop with the kitten if you change it though, but you do want to avoid this behavioral pattern from starting with your other cat!