How stressful... Even these students don't take university seriously. Kei hate being a teacher

"Sae you're late again."

Sae is an ordinary student but he gives me a lot of problems, apparently he hates me and Kei hate him.

After leaving work hours and being able to relax, Kei went to a private club. When he enter in the private room he see him...

"Are you kidding me... Sae? You work here?"

It's a +18 gay club! My student... and His teacher... Why?!