based on the post:
"I'm a firm believer that Our Son Will Byers has a cute crush on Mike Wheeler. Everyone knows it. Jonathan, Joyce, Dustin (that kid doesn't miss a thing, seriously), Lucas only notices once Dustin clues him in, but once he knows it's all he can see. Even Nancy starts to notice. The way Will always tries extra hard to sit next to Mike during movie night, the way Will stares at Mike, all wide eyed and precious, when he thinks nobody is watching. Mike is oblivious. Will thinks nobody knows.
Until one day, when Dustin or Lucas (it could be anybody, but my money is on these two) get so fed up with Will's pining and Mike's blind stupidity that during one game of truth or dare on a Saturday night, someone dares Will to kiss Mike. On the mouth. For five seconds. Mike raises his eyebrows, Will turns beet red. The rest is history."
by willxmike.tumblr.com