Well, one possibility could be that drunk Harry starts casting random spells all over Hogwarts. He might accidentally turn the Great Hall into a giant ice rink or make the portraits start singing opera. Another idea is that he thinks he's on a wild adventure and tries to 'fight' imaginary enemies, causing chaos in the corridors.
I'm not entirely sure as the description is rather unclear. It could potentially be about a character named Issei in the 'DxD' universe and some sort of action related to a fanfiction about him. Maybe it's about exploring or creating a fan - made story where Issei is involved in a stroking action, though without more context it's hard to be specific.
Issei could develop by learning the discipline and self - control that comes with being an exorcist. This would contrast with his more impulsive devil - side nature. For example, he might have to resist the urge to use brute force and instead use the more strategic and spiritual techniques of an exorcist.
Issei develops by facing various challenges. Each encounter in the harem and with the milf - hunting situations makes him grow. He becomes more confident over time.
I'm afraid it's not easy to give a clear - cut meaning. 'DxD' might be short for 'High School DxD', a series with various characters like Issei. But'stroking' in relation to 'fanfiction' is an odd combination. It could potentially mean that Issei, within the realm of fan - created stories, is having some form of interaction that is being described as'stroking', perhaps like caressing or nurturing the ideas in the fanfiction, but this is just a wild guess.
Neville could be in it too. He might be initially shocked to see Harry in such a state but then tries to help by using some of his herbology knowledge to make a potion to counteract the drunkenness. And Malfoy could show up, taking the opportunity to mock Harry until Harry, in his drunken craziness, does something that scares Malfoy off. Also, Hagrid would surely be around, being concerned about Harry and trying to get him to rest in his hut.
"The Years After the Divorce" was a book about the protagonist's story after he discovered that his wife had cheated on him on the eve of the New Year's Day. He began to investigate and finally discovered the hidden side of his wife. When he faced the mockery of fate, he gritted his teeth, shouldered the heavy burden, and went against the current to create a glorious life. Therefore, this novel matched the storyline mentioned in the question. I hope you like this fairy's recommendation. Muah ~😗