What Ginny does next was a bit satisfying to write.  That's all I'll say.

Harry's like me, all, "What do I do with it?" And Andromeda's like "It's cool, watch me be Bellatrix's creepy sister.  I'm betting he was quiet, but very stubborn.  "No, I will not eat the stewed Apricots, I want applesauce!"

CAKE!

Ah, but Snape isn't a kid, and he and Harry have all kinds of history, remember, a history primarily of Snape mistreating Harry.  And Snape is not in Harry's power, if anything, Harry is in his power, as his student.  They're mistreating each other equally, and Harry is still very much at a disadvantage.  Harry was extremely upset when Ginny spilled the beans, because she was spying on him, which is a hell of a lot more than a minor inconvenience.  Besides, Harry kept secret Snape's heritage much more for Snape's safety and privacy than for his own embarrassment.  Without Snape's concerns, the secret would have at least gotten as far as Ron and Hermione.

Harry has very little ability to stop his fellow students from being brats to Snape, especially Malfoy.  He has had little success, after all, preventing them from hastling him.  He has even less ability to stop the Wizarding World as a whole from demonizing Snape, and has released a statement that was supposed to help.  Also, snape is very good at making things worse for himself.  He is antagonistic and unsociable both to his students and the Wizarding World as a whole, which makes both unwilling to believe the best of him.  Harry can't work miracles, and while Snape might be his son, he is not his kid.

Belby is neither a Gryffindor nor a favorite of McGonagall, nor is she enabling him for that reason.  She wants to fire him in a way that doesn’t raise his suspicions (difficult) and then wait for him to go back to his fraudulent ways so that she can send in Magical Law Enforcement and they can gather evidence with a clear chain of possession.  She’s right.  In front of the Wizangamot, the notebooks would be made irrelevant because it was the “untrustworthy” Severus Snape who discovered them.  She also has enough flair to wait for him to have another “big discovery” and then discredit him right after. 

Having known people very much indeed like the Marauders and the Weasley twins, and having been both target of their bullying and object of their affections (I got pretty in high school, and all of a sudden, boys who had been shoving me in trash cans for years wanted me to date them.  It was so wonderful to tell them to piss off) I can tell you, that they are intelligent, thoughtless, charismatic, and charming, or they wouldn’t have the sort of power they have.  Most of them are good people underneath the idiocy, and most grow up to show it.  My brothers are two such people, and they grew up to start thinking and recognizing that they’re doing something wrong, and some actually seek to make amends.  I know you don’t see it that way, but students shouldn’t be expelled for what the Marauders did, with the exception of Sirius and the Shrieking Shack.  I’m sure they spent a lot of time in rather disgusting detentions, though.  Also, some of the blame should be laid at Dumbledore’s door.  He’s the one who believed in second chances most strongly, and I agree with him.

Harry actually has realized what he did, and talked about it with Hermione in an earlier chapter.  He gets it shoved into his face a little bit later on, but he has thought of it.  Remember, though, he had no choice.  He either left Snape and Eileen with an abusive parent, or he risked ripping time and space apart.  Not a great choice.