Senior, what's that on your chest?

'''*This book contains content that may be divisive, including coercive behavior, humiliation, and lactation play. In life, you sometimes come to dislike someone for no particular reason. For Seo Chan, who is usually indifferent to others, third-year senior Lee Do-jun was that kind of person. A popular senior who was generous with his wallet and well-liked by everyone. No, he was the star of the department, even treated like a hero for kicking out a hopeless troublemaker, and Seo Chan was the only one who disliked him. But, after accidentally witnessing that senior's chest soaked wet with milk flowing out, what are the odds of pinning that body down and doing something with that senior...