Not sure if controversial, but: Cocksleeve MC falls in love for literally just 'it feels good, so I love you now'.
(And I do NOT mean the actual hentai porn nonsense, I mean stories that pretend they are romances.)
Usually it goes like this:
MC falls in love because he/she turns into a literal hentai perma-horny slut and mindless cocksleeve upon a......
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