Tu eres ahora nuestro esclavo comiendo semen

The worst punishment for the slave is cum eating. Well, in this case, it is really means when the mistresses make him directly so horny that he already has to squirt in the first 10 minutes of the session. But it's even meaner that he then has to eat his sperm and that's where his horniness is gone... well and unfortunately these were only the first minutes of his treatment and the slave becomes roughly clear that this will be a very hard day for him.