i'm sure they're still friends, but like...you can tell they're not as close as they used to be. no seriously, they were like BFFs. THEY HAD MATCHING PINKY RINGS. THEY GOT THEIR DOGS TOGETHER. xD
but i think their relationship just outgrew the chummy Junior stuff. lol, they both don't really like to do fanservice...with each other anymore. cuz they're ~mature~ now. but i do believe right before Jin left for Los Angeles, he talked with Kame for like, freaking 4 hours or something crazy like that.
i don't like pairing Kame & Jin together for the sake of pairing people into ~couples~, but i do like it when they do stuff together. or when they're friendly with each other.
as for OTPs, i like Kameguchi. xD