Fortunately, Aoto guessed correctly.
The three people who have a relationship akin to siblings with Toshisuke do indeed know Toshisuke's true gender.
Luckily, Kondo and the others were alert enough to realize Aoto was speaking with a hidden meaning, implying something.
Hijikata Toshizo made a great contribution!
Thanks to him successfully distracting Nagakura and others, Aoto and the group no longer need to worry about Toshisuke's true identity as a girl being further exposed.
Moreover, judging by Hijikata's earlier performance, he's also the smartest and most perceptive of them all—just by Aoto's subtle hints, he surmised that the bath-dazed Toshisuke was most likely hiding behind Aoto now, reminding Aoto "If too dizzy from the bath, remember to exit promptly, if necessary, get some medicine," also mentioning that there are still pharmacies open at this hour.
"Hmm." Aoto nodded vigorously at Kondo, "Mr. Chokata is right behind me now, she's fainted."
