Egotists In Glass Houses summary:

Kitazono Haruhisa has always been popular with the ladies! But then underclassman Io appears, and all the girls including Haru's girlfriend leave him to fawn over Io. An annoyance at first, Io is soon smitten with Haru thanks to a certain incident. He's good-looking enough to get more girls than Haru, but this dang pretty boy Io just trails after Haru like a loyal pet and gazes at him so passionately... That's nothing to feel good about!! These past ten years, Haru has let Io's affection go to his head, but now...?+