Everyone will get some eventually, though one won't be done by Selebus if at all due to what kind of character she is. That said, this game is story focused like a proper game should be, not porn focused. As for the girls with no lewd scenes, specifically referring to the ones Selebus himself does plan to have content for, they won't get any until they are ready for it within the story. If the characters themselves aren't emotionally prepared to go that far within the story, they will not go that far. Yumi and Maya are among those who will eventually have lewd content, but that content must fit within the story. That poem isn't really that bad, by the way. If this is the worst you've written, your best must be pretty damn good. I actually really like it, it sums up the plight of not only Yumi and Maya fans, but that of us Rin fans as well. I mean at least we got some bare boobs so far, but still not much and the bare boobs happened in probably the absolute last place one would expect, in the middle of one of her delirium spells when she looks absolutely horrifying, and don't get me started on the Miku fans, who finally got a little bit. Don't worry, though, like I said before, we'll see them get their lewd scenes when it fits the story.
I see which one you're on,the puzzle in the main event "There Is Nothing" strikes again, luckily this build just went public over the last couple days and it looks like you put in a solid effort based on how far you got, I didn't even get this far before I snooped in the code, so I can help at least point in the right direction in this case.
The username was in a previous event, though I don't remember which. The new replay function will come in handy here as that's what looks like will be necessary. You'll have to replay each of the 'happy' scenes to see where it was stated. I'm pretty sure it was in a 'happy' scene at least because those are typically where the important information is given. Luckily, there are only a few of those. The problem would be if it just so happened to be information not presented in a 'happy' scene, but in a character event or main event like "There Is Nothing."
To use the new replay function, hit event tracker on the bottom of the screen, then go to the 'happy' scenes section and click on each to start a replay. No, it will not mess up your actual event progress and, yes, you can end the scene at any time once you have the information by right clicking and selecting end replay.