I also faced this blockage, and had to make a rerun. You get that option enabled if you refuse to bath with Cami, then you go to work. After that, you can travel a bit, then you go to one of the shops, and buy Cami some clothes (I bought everything I could afford except the cameras obviously), then once you reach that scene again, you get the option to change clothes, but I wouldn't recommend it for now because it's bugged, and it has been reported already. If you go that route, and choose change clothes, after sending the selfie, you're send back to a nude Cami and you once again get the options to either change clothes (loop and repeat) or cum to continue with the regular ending (Non-Tier 3 and Patreon), and you can basically get that if you skip all of this and just bathe with Cami, so until this is fixed, my recommendation is to ignore it.