He has gone a month without an orgasm, so you give him a medical inspection to make sure his penis responds normally:
1) Lie him naked on his back and tickle his genitals with a feather. Check that he gets hard.
2) Listen to his pulse in his cock with a stethoscope.
3) Ice his cock down and check that it shrinks
4) Warm up his cock again in your mouth and check that he gets hard again.
5) Lube up his cock and stroke him fast. Let go when he tells you he is close to cuming. He should not last longer than 2 minutes
6) Let him rest for 2 minutes then stroke him fast for 20 seconds. He is allwed to come if he can within this time.
If he passes the tests he is fit for another denial period.