(Warnings for yandere themes and pregnancy mentions.)
-It didn't happen overnight. Your husband was not someone to be feared yes but never by you. He was always so considerate and responsible. His presence always so stoic but gentle. The way he loved to hold your smaller form against his own. Listening to the soft heartbeats emitting from your form. You gave him the peace of mind he never got before.
-He's never had any say in anything before. His life, family, or what transpired between his brother. His inferiority complex and jealousy driving him to do unspeakable things. Unspeakable things you never held against him. You were perfect. Everything his past wife wasn't. He had everything he wanted. Finally surpassing his brother in life and strength (he was much stronger surely with his hundreds of years getting stronger and he was stronger than a dead man), the high ranking position he deserved, and a perfect wife.
-Just when He doesn't think he could be anymore blessed along comes with the news that you two were expecting. Two little ones. His own lineage. Muzan is pleased with the news, after all he thinks they'd be great to study and Kokushibo couldn't agree more already planning out what and how their lives should be. Everything is perfect.
-In his eyes only. You however have a very different view. Your husband was always kind and respectful in the beginning. He was everything you loved, but you started notices the shifting behaviors. Starting with the news of a person with hanafuta earrings and sun breathing was found. He started acting different. More distant, he didn't come home as often, but when he did he was dismissive...Until he wasn't. One day you're surprised by a new rule he placed on you. "You are no longer to go out anywhere by yourself. You are to stay within the house and go anywhere without me. Understood?"
-When you politely ask what brought this about, he only says that it's for your own safety. You can tell he's lying there's something intense about the way he's looking at you but giving him the benefit of the doubt you agree assuming he was just worried. However it was more than just overprotectiveness. His entire perfect world shattered the moment Muzan announced the existence of his brother's successor. Every buried memory, every locked up emotion, it all resurfaced.
AND HE WOULD NOT HAVE HIS ACCOMPLISHMENTS IN VAIN.
-It started with just the one rule. It was pretty overbearing but not impossible. You barely went anywhere anyways as your home had everything you need but slowly more and more overbearing. "You are to not leave this home at daylight." "You are to stay inside at all times. Yes. Even if I am not present. Misbehaving will be punished by the loss of luxuries." "Your skills are starting to lack. ..No. You cannot go to town. I will get what you need."
-It felt like the walls were slowly pushing inwards and inwards and constricting you. Every time you tried to bring up the same dismissive behaviors would play out. He wasn't going to risk outside sources convincing you to leave him. Not like last time. Yoriichi would not convince you to not leave him again. However he didn't see his possessive behavior was driving you away from him.
-Learning you both were going to be parents was the final straw. It's like something in him snapped. He seemed so pleased with learning about it only to sour the news by discussing the plans he had for perfect heirs. To train them and mold them into the perfect heirs.
-You nearly fainted from fear right then and there from what your husband became. So you fled. Fleeing during the day and never looked back.
-The rage and completely disarray of emotions pumping through his body was enough to boil Muzan's blood and send a shockwave to the lower ranks. The betrayal enough to shatter his sanity and send what little control he had left in him diving off the cliff of his tipping point.
-The monster underneath is clawing out. And it won't rest until it finds what it seeks.

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Demon Slayer Posts
FanfictionMultiple headcannons, random posts, and x reader stuff from my Tumblr for Demon Slayer.