Ah, ok, I had the same issue (I think) but now it's resolved for me! When you got the ending originally, did the last choice of "I hope you find" show up alone or with the other choice "Save me, Ray"? The first time I did it, it only showed that option to click, and that time the ending still said it was locked despite me getting the illustration and all. This time, I picked all of Ray's good answers, then when I got to the same point, 'Save me, Ray' was also an option. I didn't click it, I clicked 'I hope you find' again, and THAT time I got the ending officially unlocked. Weird, because I'm pretty sure the dialogue/narrative was exactly the same even though the game treated it like it was new (as in, I couldn't skip). So, slight bug, I guess? But it can be overcome, apparently