In fanfiction, it could be that the Ministry of Magic has some devious plan. They want to keep an eye on both Harry and Snape, and by forcing them together in this strange 'ride' situation, they can monitor their interactions more closely. Or it could be related to a power struggle within Hogwarts. There are factions that believe that by making Harry and Snape interact in this forced way, they can tip the balance of power in their favor, whether it's for good or for evil purposes.
One reason could be a misfired spell by another character. For example, if a young wizard was experimenting with a transportation spell and it backfired, it could accidentally force Harry to be attached to Snape in this 'ride' situation. Another reason might be a plot by a dark wizard who wants to see chaos at Hogwarts. They figure that forcing Harry and Snape together in this strange way would disrupt the normal order of things.
Maybe it's a part of a prophecy that no one fully understands. The magic of the prophecy forces Harry to be with Snape in this way. It could also be that Snape himself has been cursed, and as a result, Harry is drawn to him in this forced 'ride' situation because the curse has some sort of connection to Harry. Or perhaps a magical object has been activated that binds them together for a specific purpose that has yet to be revealed.
Chapter 45, ", The Governor Will Make a Move", is the clearest early answer because it turns Perbov's situation into a concrete plot event. Early on, Perbov felt a chill in his heart.. By the end, He had tried his hardest, but what followed seemed to signify that....
Chapter 165, ", Naval Battle Settlement", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from She could only focus all her attention on commanding the naval battle. to Had it not been for the ongoing space naval battle outside the....
Chapter 38, ", Attack Warning", is the clearest early answer because the buildup finally cashes out in a real clash. The setup is The cult crisis sparked by Senator Wohan reverberated throughout..., but the pressure keeps building through Through the accounts of those refugees and the words of Dennison....
Chapter 132, ", Global Strategy Timeline", is the clearest early answer because it turns Perbov's situation into a concrete plot event. The setup is They truly couldn't hold out any longer., but the pressure keeps building through Moreover, the statement "The leader has escaped" might actually be....
Chapter 134, ", What Trash is the Agent?", is the clearest early answer because it turns Green Skin Orcs's situation into a concrete plot event. It opens with After hearing Dennison Henry's report, Gu Hang mused, "So what do you... and closes on That's if the road is clear.. The key payoff is that the chapter closes with Henry clapped his hands, smiling: "Exactly. Mr. Gu intends to mobilize the army and take down Rubbish Town.
Chapter 48, "chapters, shall we practice together?", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with The Howling Wind Divine Envoy was dead, left without any human shape... and closes on He grinned and said, "Yo, captain, you look quite a mess." Yan Fangxu.... The key payoff is that the chapter closes with Hey, don't just look at the girl! Why did we exceed that much in one night?
Chapter 170, ", Mother (Extra 7,000 words)", is the clearest early answer because it turns Pei Desi's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Military garrisons are only right and proper! and follows through with Holding onto it for two extra years was two years, the Star Sector....
Ezekiel Henley presents himself as a kind, generous human who helped the Belmont family pay off their debt collectors. However, he is secretly a vampire with red eyes. He originally wanted to marry Ruelle, not Caroline, but was tricked into marrying Caroline at the wedding when Mrs. Belmont switched the brides.
Chapter 173, "Population, Production, Trade", is the clearest early answer because it turns Osenia's situation into a concrete plot event. The setup is Combined, these places had a population of over a million, which..., but the pressure keeps building through In response, Osenia's subsequent plan was to continue migrating....
Chapter 159, ", The Starting Point of the Road to Glory", is the clearest early answer because it turns Wang Jiarong's situation into a concrete plot event. It opens with However, all this was extremely bad news. and closes on The next ten slightly smaller Colossal Cannon shots followed, with....