In which Demon Slayer Tomioka Giyuu adopted two children, one a two-years-old human girl and the other a four-years-old demon boy.
In a side-mission gone wrong, agent Twilight was found by his 'fake' daughter and wife two blocks away from their home, heavily wounded. (Identity reveal AU. Contains slight manga spoilers.)
Yor didn't mean to kidnap someone's daughter. Honest.
In which Kamado Tanjirou met Tsuyuri Kanao a year before the Demon King paid a visit. (TanjirouxKanao-centric. Role-Reversal AU.)
In which Kiritsugu's newly-adopted son adopted a fat cat. (One-shot. Up for, heh, adoption.)
What if everything follows canon after On the Flip Side's chapter 12?