I ask here about how in S03E10, Kaguya addresses Moeha (Chika Fujiwara's imouto) by 1st name only after previously, in S02E02,
A - expressing reluctance to do the same for Kei (Miyuki Shirogane's imouto) and
B - addressing Moeha as Moeha-san.
This is the 1st time I've ever called someone by their 1st name only. - Kaguya about calling Kei Shirogane by 1st name.
Question: Is Moeha the 2nd person Kaguya has addressed by 1st name only?