I'm thinking it has to be Jon, because if Elias were in the mood for touch which was not currently available, he would probably just find someone getting some and hang out in their head. If you can't get your own cuddles, psychically harvested is fine. Which is admittedly its own kind of wretched, but practicality above all things, right?
The idea of Elias living vicariously through the affection others are receiving is hilarious to me. He’d absolutely do that.