Sweetie, Your Mine ...Muzan x reader

"I'll do you hard until I can't regenerate it no more"

Pov: you're a Scientist's so one fate full day you went out in the park to take a break from work you then found the blue spider lily lying next to a tree you remember you've heard about this rare flower in one of the books you read about flowers. so, you went back into the lab to do more research about the exclusive flower .. little did you know your life would be living hell form that day onwards { keep in mind demons slayer takes place in the taisho era in 1915}