Harry Potter: Discovering I Have Feelings for the Potions Professor

Content warnings: ① The author has only watched the movies, but will try to look things up on Baidu or Zhihu while writing. If you love nitpicking, this isn't for you. ② There will be OOC, perhaps a lot of it. If that bothers you, don't read. If you think it doesn't bother you but it actually does, please quietly leave without posting your valuable comments. ③ You could say there's a 15-year age gap, or you could say it's 3 years. Severus is the top and Zhou Zhou is the bottom. The author likes older men. ④ The author will give the protagonist as many cheat powers as possible, while trying to make them reasonably logical. ⑤ Severus met Zhou Zhou even before Lan did. (Before Severus first met Zhou Zhou, his memories of him were vague and buried, but they still had an influence.) This involves time travel, and I won't spoil more. I'm just explaining why the professor treats Zhou Zhou fairly well (probably?). …More may be added [Two male leads, pairing with Severus Snape] Someone who has only watched one of the Harry Potter movies with a friend, and knows most of the series from fanfiction and short videos, transmigrates into the world of Harry Potter. Oh, Merlin, is this bad? Seems like it's not too bad.