Dominate him. Train him to learn certain postures to be in, and then run him through his paces.

https://www.google.com.au/url?sa=t&r...56146854,d.dGI

If he is able to learn these postures, give him a 'reward'. Something which satisfies you more than him. Then maybe at the end of the month give him a release. Once a month should do it. You should also keep him in chastity during this time. Probably 2 weeks into the posture training.