The patient sits naked on the treatment chair. The doctor, Miss Yara, puts an isolation mask on him so that she can carry out the treatment undisturbed. The patient's hands are then restrained so that he can no longer resist the treatment. Without further ado, the treatment begins. The hardening in the genital area is treated. Electricity is used for this. The pain is intended to heal the hardened cock. However, the opposite seems to be the case. The penis gets harder and harder during the treatment. Instead of changing the method, the doctor turns the current on harder and harder. Now the slave realises why he has been restrained. He can no longer resist his treatment. He is completely at the mercy of the doctor. The slave gasps and moans in the hope that an orgasm will release him. But the pain is too great. The doctor finally explains that she will now massage out the hardening. However, she is careful not to create a good feeling. The patient suffers a ruined orgasm.