At InstitutionX, a bound submissive writhes on the Sybian, his prostate a target for intense, relentless stimulation. The femdom mistress manipulates the machine's pulsating dildo, driving it deep into his ass, while he's hogtied and helpless. She milks his cock, drawing out ropes of cum, only to push him further with more prostate play, coaxing out multiple, shuddering orgasms.