the little sister is a greedy bitch, idgaf if she is "dying" why tf would you try to take your older sister's husband while trying to act all cute and "innocent". i hope that illya will make the ml and the sister regret their shit with the child always reminding them that
She couldve become friends witht the saintess and used that to her advantage and for the jewel keep it for herself and let the "heroine" deal with her happily ever after herself