Personally I think Mike would not be aware of Reddie, unless it became insanely obvious i really think that guy would just think "wow, their friendship runs really deep. Amazing.".
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Personally I think Mike would not be aware of Reddie, unless it became insanely obvious i really think that guy would just think "wow, their friendship runs really deep. Amazing.".

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What if I made... an IT Obsession AU... but Mike is the one who makes the wish and Henry's the one who gets possessed?
Mike gets the one wish willow as a last minute birthday gift from his granddad and uses it to wish that Henry couldn't bully him anymore and had to like him, that instead of Henry seeing Mike as his enemy he would see him as his best friend forever. Then he breaks it and obviously shit hits the fan.
At first it's very small, at school the next day Henry walks up to Mike but instead of bullying him he seems oddly friendly. Then after school Henry says he's sorry for bullying him all this time, and when Mike asks what's with the sudden change of heart he says his dad got really sick and it's making him rethink some things. Mike expresses sympathy and walks off to go hang out with his friends, but Henry asks if he can come too. Mike says it would be super awkward but if he's still hanging around here after he gets back then they can hang out. When Mike starts walking home later it's like ten PM at night and he finds Henry is standing in the exact same spot as he left him, perfectly still like a statue. What's worse is he's clearly covered in vomit and pee so he's been standing there for a while. Mikes all horrified but all Henry can say is "Miiikeee! You're baaaack!".
Mike tells him that he needs to go the hell home and clean up but Henry says he can't stand to be alone right now, and he starts crying about his dad getting sick. Mike tries to comfort him by grabbing Henry's hands and telling him it's gonna be okay and it seems to work for a second, until Henry suddenly takes his hands away and starts freaking out out of nowhere. Mike asks what's wrong but then Henry snaps back to normal and just smiles. "Sorrrryyyy, I had a panic attack.".
Mike says they can have a sleep over since his grandparents aren't home if he really is scared to be alone and Henry seems over the moon at the idea. The actual sleep over is fine, they just have a normal time. it's when mike wakes up in the middle of the night and sees Henry's watching him sleep in the corner of his bedroom that he gets concerned. The next morning Mike walks into the kitchen to find that Mr. Chips has been taken out of his grave they dug and placed in the kitchen in a weird make shift memorial. Mike is obviously appalled but Henry seems confused as to why Mike doesn't like it. "I thought it'd be sweet... it's an apology... since we're friends now.".
At school the next day all of mikes real friends ask what the hell is going on with Henry and Mike says his dads sick and dying, to which Richie points out that he saw butch the other day patrolling the town and he seemed perfectly fine. After school Mike meets up with Henry at the capital theater and they have a normal fun time playing games and watching a movie like friends, until Mike asks him if he lied about his dad being sick- to which Henry has a public melt down in front of everyone. It is then and only then Mike realizes what has happened and that the one wish willow has worked. Still, he's not totally concerned yet. I mean, even though Henry is acting a little crazy at least he's not bullying him anymore. That's gotta count for something, right?
Then shit gets really crazy. Henry starts being extremely possessive over his bff, he refuses to be apart from him for even a second, one night henry is hanging out with the losers club and he gets so mad at Bill for sitting next to mike he drags his chair back and sits in his spot, every once in a while Henry will have these moments where he seems to be terrified at how he's acting, as if he's been possessed. He even cuts up bits of Mr. chips and feeds them to mike in a breakfast he made him. He's uh... not doing too well.
Eventually the real Henry manages to talk to Mike and tries to beg for him to kill him, to which Mike asks what's so bad about him being a better person now, to which Henry says he hasn't actually changed, someone else has just taken over and it's excrutiating. Still, Mike does nothing because he doesn't feel too bad for him in spite of all he's done. It's only when Henry starts killing Mike's other friends so they could be the bestest friends in the world that Mike starts to think maybe wishing away Henry's autonomy has some bad consequences. I mean, the opposite of hate isn't love, it's indifference. Bro could have wished for that and he would have been fine.
This is au is not to say Mike is the same as bear and Henry is the same as nikki btw, they aren't comparable at all. One of them is a dude who essentially wanted to rape a girl and the other just wanted to stop being bullied. Nikki does nothing wrong ever and just gets lured into SA by bear while Henry is genuinely terrible and hurting mike. You're not supposed to really think too deeply about this au- although I think a similar lesson could be learned from this, in that you can't force someone to like you. Even if they're a bad person lobotomizing someone so they'll like you is pretty fucked. Mike is just far more justified and less shitty than bear cause he actually had reasonable justification. And also he's literally 12.
Trying to criticize the representation of IT is always so infuriating, because everytime you do it people will always cry "why do you gotta take everything so seriously, just turn your brain off an enjoy it" and like, i don't know man, i just think the highest grossing horror franchise of all time should treat it's female and non white characters like actual people instead of props.
Ya know even though Bill is probably my least favorite of the losers, I really still do love him a lot.
He's such a sweet and caring guy, and he goes through so much insane trauma that pushes him to the limits of sanity much like Henry, but unlike Henry he never loses the spark that makes him kind. He's too self sacrificial, he'd die for his friends a million times over if it meant it'd ease their suffering just a little. He's head strong and teasing and he writes terrible endings and he doesn't like people to analyze his writing, but at the same time he's a wonder with words. He never quite heals from the pain of lying that day, but he's a work in progress and that's okay.
I don't think Bill gets enough appreciation, i mean yeah, people like bill, but they don't truly appreciate him enough.
Oh Bill Denbrough, what a beautiful boy you are.
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I think one of the saddest head cannons i have for my wtd au is that the reason Clint bowers could so effectively manipulate lilly with her mental health issues and threats about JH was cause he did the exact same shit to butch all the time cause he's autistic.
Ya know shout out to Lilly and Butch, who were subjected to ablism their entire lives, and then proceeded to do the same crap to Henry because they didn't learn a god damn thing from it.
When someone says Eddie Kaspbrak is weak and not very brave:
Not that anyone really cares, but this is the exact vibe I want my Welcome To Derry fifteen years later AU to have
I want my Welcome to Derry FYL AU to have a very domestic horror aspect, since IT is still a horror story, but given that it takes place between Pennywise cycles, the horror is reliant on Derry's social aspects and the people within it. The horror in this au comes not from Pennywise killing people, but what happens in between the times Pennywise ravishes the generations. What happens with the pieces Pennywise broke in the last one, and what horrors have to happen to set up for worse things down the line. As society pushes Ronnie, Marge, and Lilly to the roles of wife and mother, they each have to battle an inner conflicting that is horrifying all on its own- as well as outside forces.
Ronnie must figure out how she fits into her life as a wife to Will and a mother to Mike as she's spent so long in survival mode trying to prove herself to others she can't tell if having the career she's worked hard for or playing housewife to Will is what she really wants, while also dealing with being stalked by Clint Bowers on deaths door who holds the key to a secret that could put Ronnie's whole life in jeopardy. Ronnie's life is further complicated by the fact that her own husband is lying to her, using Ronnie's scattered memories as a way to hide the darker parts of Derry from her, something that, although Will means well, is not the selfless act he wants to think it is.
Marge must wrestle with feelings of still trying to please others, as she becomes embarrassed with herself and the life she's about to have, as she flip flops between feelings of inadequacy as a wife and mother for simultaneously having an imperfect kid, a husband she can't fully love as much as he deserves, and the fact she even wants to be a housewife at all in a time when other women are becoming more independent and free spirited than ever. But this all gets worse as she begins to suspect a spirit is following her, and if not, she's going insane from the sudden changes in her life. Is the only thing keeping Marge from moving on and being the best person she can be imaginary walls, or is the unfinished business manifesting in something more supernatural? Marge can't decide, in fact, she can't decide on much of anything.
Lilly has it possibly the worst of all, with her facing much of the same confusing feelings of what she wants being different than what she has. She must grapple with her own glaring flaws due to her unresolved trauma, which manifests in her rushing into various things without realizing the price of them. She marries a guy because she eases the guilt of her past trauma, she has a baby because her friends do, she doesn't listen to other people's concerns because she's been too burned by others in the past. Lilly will struggle as she tries to fight for dominance and control over her life, attempting in vain to force a happy ending for herself once she realizes she can't have one naturally. She will hurt her son, and her husband, and eventually herself along the way because she is too immature and vulnerable for the life she thinks she wants. Worst of all though, Henry's birth will mark the appearance of weird trauma dreams and psychotic episodes for both Lilly and Butch, which slowly devolve them into a shared madness through no fault of their own.