Heroic Rivalry

Tiffany was having a great day, but then a family of 5 siblings came. The oldest (Very surprising to Tiffany, since he's so immature most of the time) threw her by the legs! Then his sister apologised! Yeah, the guy who threw her's sister. Not him! He didn't say anything like an apology. Naturally, Tiffany was pissed. But she saw that they were a bit injured, so out of pity, she brought them to her home. They moved in and did all of the chores she didn't want to do. One day, when they were eating at a cafe, some vampires were gossiping about demons, so Base (the guy who threw Tiff) and Tiffany got the great idea of having a competition on who could kill the most demons.
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This story is just a story that me and a friend randomly made for fun, so it may not make any sense and have some plot holes. Lots of plot holes. It has a future-fantasy setting, so it's basically in the future and has fantasy bits in it. I'm not the best with grammar, so it will probably not make sense sometimes. Inconsistent updates. This will probably have action in it and I've never written action stuff before, so it might suck, but I have read lots of fantasy-action webnovels that I could use as reference. The action will be in future chapters mostly, not in the beginning.
@TJSsayshi wrote this story with me (@TJSsayshi: HELLO!! [@TJSsayshi says hi]). She helped create most of the characters, their backstories, and the species we invented. She will help me with grammar and editing the chapters. So basically, she's my beta reader, if the grammar is wrong blame her <: Just kidding!
WARNING: LGBT may be mentioned (specifically in gender) and misusage of pronouns! Also spoilers in the tags for some of the character's backstories. (Doesn't say which characters' backstories tho)