ないまぜな熱情

Iori, a highschool student, fantasizes about being held by handsome men. His stepbrother, Ayato, has a face that's just his type. Though he spends his days masturbating with his stepbrother in mind, he tries to stay away from Ayato, as he becomes overcome with lust whenever he smells Ayato's scent, or sees his cold gaze. Just when Iori is trying to prevent himself from getting carried away, thinking "I have to stop this," he discovers Ayato, who has brought a guy into his room... (Source: Overlap, translated) Note: Includes an extra chapter.