One Plus Two

How can one ever be satisfied with just one? That's Haru's life motto. As usual, he lures a younger guy who enters his strike zone and devours him whole. Not bad for a hetero guy being his first~ he thinks for a split second, Did this guy just eat me up??!! The more he thinks about it, the more infuriating it gets—that big-dicked, handsome, cute, infuriating bastard! He happens to run into him again in a college liberal arts class, but this time he claims not to know him.. His speech and behavior are completely different. Is this some kind of concept thing..? What..? He's a twin..? That's a lie, right..? (Source: MrBlue, translated) Note: Includes two extra chapters.