Some slaves are so boring to me I can't pay any attention to them. While he removes my heels and starts worshipping my feet I get on my phone. I can't help but notice his hard cock and I take a photo of it. I give slave permission to cum if he can release between my toes, and if he fails to cum as directed he will spend another month in chastity. I place my foot on his cock and mush the lube around. I order him to jerk himself off in 20 seconds, and knowing that these opportunities are rare, he manages to do so in the nick of time.