A fully clothed straight wife brought to a climax, by a strange (as in stranger) woman whilst her husband watches at a party, surrounded by the other party goes who don't notice
The wife is wearing a chastity belt and bra with remote-controlled e-stim pads and dildos. The keys are in a time-locked safe, and the remote control is discovered by chance by a husband's colleague's girlfriend - who suspects what it is but doesn't initially realise the wife is helpless as she plays with the controls...