If you're looking for manga similar to Massive: Gay Erotic Manga and the Men Who Make It, you might like these titles.
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Includes the following chapters:
Delivery men end up giving more than just the package to their customers.
Gloomy and shy Seta went unwilling to his class reunion and got more than he bargained for.
A teenage boy is having troubles with the pheromones his body emit, but school janitor might be of some help.