I think one day Elias peeked in Jon’s head while he was masturbating only to find Jon fantasizing about being raped by Elias and trying to fight back by choking him. And Jon felt soooo guilty afterwards for not only fantasizing about rape (and putting his own father in the role of rapist) but he came to the thought of hurting him, meanwhile the thought of Jon choking him while he breeds him has made Elias so hard it’s physically painful for him.