MAFS' 'sickening' twist: Insider ALI DAHER reveals which brides and grooms say YES to the 'deal with the devil' final challenge that's set to detonate the few remaining couples: 'It was f**ked-up'

Married At First Sight will end this season on a twist so shocking that insiders are calling it 'sadistic' and 'f**ked-up'. Now ALI DAHER reveals who fell into the most diabolical producer trap of them all...