Undertale Fanfiction

So first of all, this is gonna be an AU where Sans and Papyrus are not brothers. And their personalities might be a bit changed. I know that i am not good a puns, so sans will not have that many puns. And also Frisk will be a girl in this story.
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Sans x Papyrus
In this story, Sans and Papyrus will be living together like they do in the game, but they are dating and not brothers. Then one day Frisk falls down, and everyone calls her Chara, until she says her name. This will also have my oc Rosey in it, who is gonna be sans' and papy's actual child.