I think I lost the plot, what the fuck is happening?
Sou asked Hinata to introduce him to her friends; she responded by introducing him to the other guards. The other guards think with their pussies, so they decided to cosplay while talking to Sou. Sou found this way too similar to how his family acts, and started acting really irrationally and mixing up who he was talking to, in the process concluding he's a creep for inspiring this behavior.
Hinata responded to all this by also trying to dress more sexily, but since Sou's behavior is so out of the gender norms for men in this world, she's worried about him being hysterical.
In short, Hinata and Sou are starting to realize just how incredibly different their social norms are.