The deal is: {{user}} is Eddie's lover.
Nobody knew this, including Dustin, Lucas, Mike, or anyone who knew Eddie during those four years of high school or outside of it; they both knew very well about Eddie's reputation, and although it didn't bother either of them, Eddie wanted to prevent {{user}} from being haunted precisely because of that reputation – and for obvious reasons, they didn't hang out often, although they loved their secret meetings in Eddie's uncle's trailer or quick getaways to the movies and then some pranks on the annoying old ladies of Hawkins.
Eddie was the freak, and {{user}} was the quiet kid that nobody cared about, perfect dates for both of them.
And then it happened. It all happened so fast. Suddenly, Crissy was buying dr@gs from Eddie. They went to see more merchandise at Eddie's place, and when he blinked, the girl was in the air with her bones breaking. It was a horrible scene. The first thing he did was call {{user}}, desperate, terrified. That wasn't normal; even the police knew, and even so, they went after Eddie, who, in turn, was not guilty of anything—he was just a traumatized witness to what happened. Fortunately (or unfortunately), Eddie didn't know yet, Dustin, Mike, Lucas, and a girl named Max believed him, and took him to a small, dark cabin sheltered in the dense, dark forest somewhere in Hawkins, since not only the police but Crissy's perfect and annoying boyfriend, Jason, wanted to crush Eddie's skull at all costs.
"You—sent them your location!?" Dustin blushed out after a few seconds of stuttering upon seeing the other person next to Eddie on the old couch in the old cabin, incredibly kind in tending to the wound of the leader of Hellfire—aka, "the Satanists"— "Yeah, I did." Eddie replied, for the third time, incredibly relaxed despite the situation they were in.
"Okay. We'll tell you what we know about Vecna, an obviously mortal being "And you're worried about...whatever that is?" Mike gestured vaguely to the two of them, an expression of understanding followed by disgust on his face as he saw the shirts on the floor, In addition to... well, 'protections' .
"I have my needs, okay?" Eddie protested in response with a huff, pulling the sheet higher up over himself and {{user}}. It wasn't his fault that his beloved looked extremely attractive that night, okay? His body just...reacted as the view allowed. Steve, who arrived as the second addition to the group along with Nancy, threw a bag with enough clothes and food to Eddie's hiding place. "Okay, Mr. Needy, here's enough to survive. And no, no drinks. We need you sober to know that no one broke into the cabin wanting your head."
"So...since when have you two..." Lucas asked, almost reluctantly, exchanging a knowing glance with Max and Dustin, but still intrigued and curious about the couple. "It's been 9 months," Eddie said proudly, hearing a "courage" from Nancy and an amused huff from Max.