The first time Luigi met Bowser, both him and Mario were attempting to save the princess after she was kidnapped. They were in the middle of their battle when Luigi had started to burn up.
He passed it off as it just being hot in Bowser's castle due to the volcanoes, but ended up passing out. He woke up in Peach's castle and found out Mario had saved Peach himself.
The next bunch of times they were saving Peach, after multiple more attempts at kidnapping, Luigi kept passing out. Mario thought he was sick, and the doctor he was sent to had proved that Mario was wrong, although Mario didn't know.
Multiple more battles commenced, and Luigi kept passing out. At this point he felt like a burden to Mario, and Mario had to keep letting him know he wasn't. "Weegee, you're fine. I don't-a think you're a burden. Everyone gets sick, its-a normal!" He told Luigi, and he felt better about himself.
It was about a week after that conversation before Bowser turned the tables on Mario and not only Kidnapped Peach, but Luigi aswell.
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Stars and Mushrooms (Bowuigi - BowserxLuigi)
FanfictionAn Alternate universe where Luigi and Bowser are soulmates. Soulmate marks would always appear on someone of the same species. Mixed marks were not natural. The marks, whether it was their name, first words, or even a symbol, were never given to tho...