Ruined orgasm with footjob

Cassie arrives in red high heels. The slave kisses her legs, then Cassie takes off her high heels. She pours oil on her slave's penis and does footjob on him. The slave has a very hard time cumming, Cassie gets more and more angry. In the end, the slave manages to cum, but Cassie continues footjob on his penis and ruined the orgasm cause she not stopping.