Kouhai no Oppai ga Suki Sugiru

I came fantasizing about my kouhai! ♥ Clueless puppy Kouhai X Serious Cool Senpai. Oppai… of my dreams?!

Okada is a lone wolf who’s capable at work but doesn't get along with his boss or coworkers. His only stress reliever is by j**king off to muscular gay AV. One day, Okada's boss puts him in charge of training the new employee Katou, who is the embodiment of Okada’s dream guy!! From that day on, he fantasizes about him every night?!

(Source: Media Soft, translated)

Note: Includes one extra chapter.