Machi B-geum Manhwa-cheoreom!

Hui-Won, who had been harboring a grudge against his younger parachute team leader, Ju-Young, had been bullying him. Hui-Won, who had a crush on Ju-Young's beauty, had been secretly drawing BL comics featuring herself and Ju-Young, pursuing his hobby as a popular doujinshi artist. Then one day, Ju-Young discovers Hui-Won's storyboard notes! Thinking it was over, Hui-Won cautiously watches, but Ju-Young demands that he rape him, just like in the comics...

(Source: Peanutoon, translated)