Sugar to Mustard

[ Training the younger partner I SM matched with is amazing ] It’s a world where S and M matches get systematically created. Office worker Masachika (M) is introduced to the younger university student, Seiji (S). Masachika intended on taking the lead, but he was led around by Seiji’s unexpected S techniques, and made to come relentlessly! With their physical compatibility being ◎, and their natural transition into living together, Masachika plans to coach Seiji into becoming his type. However, the gap between Seiji’s kindness and his relentless attacks makes Masachika’s heart skip a beat!?