Gland transformation failed! Has your physique become awesome? ! So how to choose? Or...
Modern ABO (including private equipment)｜Micro abuse｜HE
Private: Permanent marking does not involve the genital cavity and knot formation. Both temporary and permanent markings are done by injecting pheromones through the teeth into the glands in the back of the neck. The difference is the amount of pheromone injected.
Concept: Are pheromones the basis of ABO love?