Ruby Red wo Kamikudaku

*I want to be "special" to my sensei.* Akane is an Omega who can see people's pheromones as multicolored "crystals”. During his school days, when he was lonely because of his peculiar constitution, he meets Makise, a school nurse teacher. 5 years later, they are miraculously reunited, but Makise has a secret..? (Source: Libre, translated) *Note: Includes one extra chapter.*