Rape fantasy Jon has had in S4 specifically:

What if Elias had him drugged? Somebody (maybe Peter) slipping him something, or using chloroform to put him under, bringing him to Elias’ cell while he’s all nice and drugged. Fucking him over and over again. Keeping Jon all hazy and helpless while he uses his body, Jon barely aware of anything except how good Elias’ cock feels, how full he is, cumming again and again. Elias not letting Jon leave for hours or even days, not until he’s sure that Jon’s been bred nice and full. That Jon will be leaving with a piece of his father growing in his womb.