Hearing Derek's command was all that Stiles needed. The slave rocked into Derek's pumping hand and when he heard the word 'come' he was done. The human cried out as his orgasm came hard and fast, his seed spilling out onto Derek's hand, the bench, and Stiles' stomach as Stiles continued to rock until he was trembling. Unable to hold himself up he slumped against the spanking horse with a noise.