That Smiles Gonna be The End of Me! (Jaden/Haou×Jesse/Jehu×Reader)

The title speaks for itself, doesn't it? ( ￣ ∇￣)∠ ))
And I know I'm coming into the Yu-gi-oh! Fandom with a story a little later, but what the heck, this is a fusion story of all the things that are tagged down below. I DO NOT OWN YU-GI-OH! GX OR ANY OTHER ANIME THAT I MIGHT HAVE TAGGED!! ALL RIGHTS GO THEIR ORIGINAL CREATORS!
Also threesome warning! And fluff warning! (And maybe 🍋 cuz I'm kinda considering it)!
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There was a story of a Supreme King who fell in love with a Great Sage that protected the Spirit world. This king was the ruler of Duel Monsters, and his power knew no equal, that was until he met the Sage. Waging battle after battle, he couldn't understand why he was the one being defeated, until he went to fight on the battlefield himself. One glance, and he almost fell in love on the spot, and battle after battle, which all led to even more defeats made the King's desire for the Sage grow. Time had passed, and eventually, the King decided to stop the fighting and call a truce with the Sage. But the peace treaty was proposed by marriage, which was a shocker for the Sage, but despite her protests, she took the deal. The Sage accepted out of wanting peace, but the King accepted out of passion and desire. With that union, the rift between Duel monsters and Spirits was bridged for eternity, and that's why Duel Monsters Spirits came to exist.

This story was uncommon for the children's bedtime genre, but (y/n)'s parents told her the story every night when she was a kid. The same thing with Jaden's parents and Jesse's parents, too. It's baffling enough that they were told the exact same story, but why was it always about the Supreme King and the Great Sage?