The Valet And The Crown Prince - Mario/SAO Crossover

(Starts from SAO Light Novel Volume 11, includes portions of the anime though)

When she was a little girl, Tiese was nearly abducted and raped. She was saved, though, by a man with the face of a tiger. Her parents were thankful to the man for his help, and Tiese never saw him again afterwards, though she was curious as to who he was.

What her parents never told her was that the man who saved her was Bowser, King Of The Koopas - and he was not even from this realm. Nor did they tell her that made a deal with him - in helping him return to his own world, they promised Bowser that their daughter would be betrothed to his first son.

Both of these things come back to turn Tiese's life completely upside down years later when she's about to be raped again - with Eugeo unable to do anything, when a boy with blue hair and a single pointed tooth in front of his lower lip comes crashing through the window, saying that he's come for Tiese, his bride.

(Ludwig x Tiese, AU! Tiese, AU! Bowser, AU! Ludwig, Alternate Universe)

(Rated T for some dark scenes, especially at the start. And because Ludwig - and Kooky - are rightfully enraged. I don't own SAO or Mario.)