을 빨아주는 어린 학생

You need to study urgently so that you can pass this subject, you need to pass no matter what, so much so that you called your friend to help you review. The detail is that they quickly get bored, and believe that after a few minutes of reading they deserve a break. But they are 2 young people alone with no one to observe them, there is only one way to relax in the face of such a stressful subject. In the end it can be said that at least they studied anatomy well haha.