Well, I mean, somehow you have yours living in society, which, to be honest, would be quite rare and hard, unless people never found out e was a cursed child

What you could do (maybe not quite immediately, but soon) is have your character accidentally reveal that he is a cursed child, and then he has to run, when, once again, the Kirihayas hear of this and ask someone to go look for your character, how it works from there is up to you (whether it is Yuki, or Caits characters will depend, also depends on if you wait or not for this confrontation to finish or not)