If you really liked this story then you may continue reading it here:
https://www.wattpad.com/story/335829127-30-day-otp-challenge-continuation-killermare
It's being rewritten by @Galaxy_Valdez! So make sure to check it out and make sure to check out all their other books!
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30 day OTP challenge - NightKiller (DISCONTINUED)
FanfictionA misterious creature gets Nightmare and Killer to complete a series of challenges for the following 30 days. This challenges allow for both of them to... strengthen their relationship and trust each other more.