Peeing fetish?

Me and my SO of 4 years were getting sexual via text message (long distance) and he was asking for photos of the normal things like boobs, pussy, butt but then I said I needed to stop because I needed to pee and he went crazy asking me for photos and videos of me peeing. He's never asked for anything like this before and we always used to joke about it so I never thought he'd be into it? I asked him and he said he was being 100% serious but I'm not so sure about it. Has anyone else got a peeing fetish or have a SO with one? I want to make him happy and provide the photos etc but it's so weird for me!