I was rewatching the scene where Mary Lou finds Credence with the toy wand, and found it interesting that the shot kept cutting to Chastity while Mary Lou was preparing to beat Credence. I've seen so little exploring Credence's relationships with his sisters, and as a big sister myself I would love to see Chastity protecting Credence in any small ways she can.

Tangentially related ideas:
- When Grindelgraves finds Credence crying in the church, he's crying over having killed Chastity, one of the few people who ever tried to show him kindness.
- Chastity knows that Credence has magic, and helps him hide and cover up the effects.

My only stipulation is no incest; other than that I would love to see any kind of story about Credence and his big sister Charity.