You know that moment when they’re in the Upside Down and it’s just Steve, Nancy, and Eddie left? Well, it’s like that, except that Nancy goes first, and Vecna enters Eddie’s mind.
Vecna intends to scare him, to show him horrific images. He wants to show him things so terrifying that they’ll think twice before coming to attack him on his own turf... Except that’s not quite how it plays out.
Vecna confidently enters Eddie’s mind, but he is soon unsettled; he does not quite know where in Eddie’s mind he has landed, but what he sees there throws him off balance.
Eddie’s mind is filled with visions of Steve. Visions of things that actually happened, and above all, visions that are merely Eddie’s fantasies. Vecna sees kisses, so many kisses, and some of them are really, very... hot.
He can also see that Eddie’s hormones are raging and a very vivid imagination (Why does Steve have TWO dicks in this vision? And OH MY GOD! Is that a tentacle in this other vision? And a fucking whip over there? And a threesome with two Steve? And the foursome version with THREE Steve? And what is that stupid sailor outfit doing here? And why is Harrington suddenly in sportswear with those ridiculous tiny shorts, in that other vision? And why is Eddie over there wearing a cheerleader outfit, with a skirt so short that it’s completely against the rules? And is the Eddie in that vision wearing a pair of fucking lace panties? And why does Harrington suddenly tell him he’s the dirtiest little slut he’s ever seen?)
Usually, it is his victims who try to escape his mind; this time, it is Vecna himself trying to get out. Far too many bare-chested Steves are blocking his way out (he is so flustered that he forgets he has control over the situation and can leave whenever he wants.)
When Vecna finally manages to get out of there, Eddie comes to, and everyone, panicked, asks him what just happened. Eddie explains to them that Vecna was inside his head and spoke to him. They all assume Vecna was threatening him, but Eddie just shrugs, saying that Vecna simply told him, “I understand why everyone calls you Eddie ‘the Freak’ Munson.”
Eddie’s fantasies are completely uninhibited, and Vecna has seen the worst of them. The only thing he hasn’t seen is the fantasy that means the most to Eddie: Steve looking at him with eyes full of love, cupping his cheeks in his hands, and whispering how much he deserves to be loved and how much he loves him, before kissing him tenderly.