I think one day in S4 Jon has the thought, “what if I was Elias’ 24/7 free use sex toy,” and his sexual fantasies are never the same again.
It’s about Elias wanting him so badly he won’t let Jon say no, ever. It’s about him needing Jon close at all time, loving him so much that he decides to keep him forever. It’s about being freed from the burden of making choices (he can’t choose wrong if he can’t choose at all), it’s about everything he’s ever wanted happening without his permission in a way that nobody could blame him for. It’s about being loved in a way where he doesn’t have to do anything but perform Tasks satisfactorily, with no expectation of demonstrating affection or romance Correctly. It’s about sex that isn’t complicated because he doesn’t have to choose or know what to do because someone who knows better is making all the decisions for him. And he doesn’t know. He’s lucky if he’s managed to connect a handful of these dots, nevermind all of them. All he knows it that he feels guilty of how much he loves this fantasy, how much time he spends desperately fucking himself on his fingers and pretending that it’s Elias’ cock splitting him open, whimpering no no please dad stop as he cums.