I feel like this is a kancolle doujin manga first...
Hibiki has probably read enough of them to be savvy with interruptions. And seeks to prevent them.
Ah, we've got your swimsuit all ready, see!Eh? Sempais, what's with those outfits...?I'm wearing one too!?Heyya! You finally made it♪Why...?
Do they not say that the best way to deepen your amity is to socialise in the nude?But yeah...
Having a party in our big bath - that's just not a done thing, innit?Nude Socialising