The party is for Kaguya and Eirin's classmates and their mothers. Yuyuko isn't their classmate.
Starrre
Push
.... Hmf!
What a nice girl you are, Junko. Aaaaah!
Ray-sen-chan, say "Aaaah"!♥︎
Gasp! It's her...!
Raaa!♥︎
Ah...well, in that case...
It's all right, we've got plenty of baby food here.
Eh? No, it's fine. Sorry...Go on, Youmu, you have something to eat too!Why don't you come in, Youmu?Huh!? No, just now and then...I just came to return some things I borrowed...