The Demon King and the Hourglass ~Getting Reincarnated as a Fairy and Becoming the Future Demon King's Obsession~

I was reincarnated into an otome sim RPG world as the fairy whose (supposed) role was to beg, "My world is in danger, please travel to another world and defeat the Demon King, oh Hero!"

But I ended up getting caught by the boy who's supposed to become the Demon King in the future (slightly OP, slightly yandere).

*Really, really mild smut.