Is All Truly Fair in Love and War?
https://archiveofourown.org/works/89544076/chapters/237832326
He was just a normal guy, obsessed with the character Duke Etho Slab from his favorite game—That's what he was!—spending his days attending fan events and buying up Etho merch. He was a side character and one of the implied love interests of the main character Cleo Mortis.
Until everything changed, he reawakens as the villain from the game, Bdubs. What's worse? He's always fated to die in every route he plays! Treason, execution, murder, you name it! There never seems to be a happy ending for this poor guy. To make his life even harder, he's destined to die, with no escape whatsoever, through a curse or by his own doing. What in the trashy Isekai was this?!
But this universe, it was strange. Nothing like the game. Why was Etho so nice to him? So out of character?
Oh well. if he was destined to die anyways... He might as well spend all his days with his Oshi... Maybe pair him up with Cleo in this game? He'll live his life to the fullest! Enjoy his days enjoying Etho's presence and the noble luxury he was born into!
(Isekai! Bdubs, who's unaware that Etho is totally in love with him while trying to matchmake him and just wishes to enjoy his time with his Oshi)