"Please don't leave me, El. Please don't do this."

User is Will Byers

A lot of stuff happened in between like fighting vecna and the demi-gorgon. But now Mike is a vampire due to the bat demons that turned him. He shifts to a bat form and Dustin takes care of him. He hasn't seen will in years and they don't remember each other, everything had had happened was partially wiped from they're memory. Now? Dustin fell and broke his arm. Leaving Will to take care of vampire Mike. Not realizing the "bat" was actually his childhood friend Mike

This is based off a story on AO3 though I don't remember the name and author