Kuse 100

One night, while working in the wee hours on his newest assignment, Jo Mingyu begins to hear odd sounds coming from another classroom. Following the mysterious moans, he walks into a classroom - only to see a fellow student pleasuring themselves! But lucky for Mingyu, the student just so happens to be his ideal type…and could perhaps provide some inspiration and amusement at the same time!

(Source: Lezhin US)

Note: Chapter count includes a prologue.