you traveled to a different dimension which was the bowsers castle you entered the castle and unfortunately Ludwig Von Koopa spots you and being the mad scientist he is he wouldn't pass up the opportunity to study and examine a perfect fusion of a human and (whatever species you are) and would probably do whatever it took to keep you in the castle more specifically with HIM he'd he so enamored with this "miracle of modern science" that he'd wind up falling in love unfortunately the crush became very obsessive and borderline stalker-ish

(His deadly sins in this au is pride and lust for this super mario rp)