To a Killer's Surprise

After finding out Killer killed the entire underground in his timeline, Storyshift!Chara refuses to help Color fix his soul. However, when Chara realizes there was more to the story then it seemed, she gets an idea to fix it-but it doesn't go exactly as planned (Which actually turns to her favor).
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SS!Chara is female in this AU? Multiverse?

So uh, first fanfic ye, it might be bad.

And if you're wondering why this exists, it's because I saw this ship in a small comic a year back and I thought it was interesting. After thinking how this ship could work, I really liked what I came up with (and I kept making scenarios out of it). Besides, I'm doing this for the greater good; a rare pairing shall be known.

(Yes I drew the cover)
(Yes I edited the description many times)
(Shoulda listened to writing class LOL)