Mistress Darcia wants to be in control of everything, including her favourite toy, the slave too. She restrains him well, making it impossible for him to get away. Not that he would want to run from her amazing handjob. But after the first few minutes the poor slave notices, that it's not a reward, but a punishment. Mistress Darcia gives him just enough pleasure to keep him hard, but also torments his member mercilessly.