"...No, no! No joining!" Rin tried to firmly establish his presence. It was quite difficult to do, considering the hand placed over his eyes in an attempt to not watch his students glomping each other while wearing such outfits.
Well, he was going to have to look eventually. Hesitantly, he removed his hand, and tried to give her a stern glare, "...S-Suzuki-san, this is... not at all a proper way to advertise your club! Come on, get inside, we're going to the teacher's off..."

...

"Who's taking pictures?" the teacher yelped, frantically searching the crowd for some sort of peeper. It was difficult to pinpoint exactly who it would be, with the growing crowd.
My job class isn't suited for this! The despairing teacherlamented. Well, he had to try and exert his authoirty somehow. And protect the decency of his students!

"O-okay! Suzuki-san! You and your friend, teacher's office! Now!" he commanded, "...Actually, on second thought, please change into your uniforms first, then go there. We'll discuss this inside!"