Mairimashita! Iruma-kun - Vol. 35 Ch. 308 - You're A Child

[Malware2085]

Not sure what Clara's secret could be, but Azz's is probably his actual bloodline magic that was referred to quite some chapters ago. Ch. 238 For reference.

Clara's secret might have something to do with her wings, since she didn't want to show it during the girls' first party after the Batra Party