I like my best friend sexually, what do I do?

ghhcyfg
So there's this girl who we've been good pals at work, but over quarantine we've become really good friends, she's definetly one of my best friend. I asked her out about a month ago and she said yes, but then changed her mind, to which I kinda agreed as I also felt that if we were together a bunch of things would change like we'd have to be more sweety sweety and less the chill that we have right now which I didn't want and I assume she didn't either. I really want to keep our good friendship, but I also think she's really hot, we're also both really innocent in a way which makes me really wanna get sexually intimate with her, and the comfort that she's one of my best friends also adds to that. What should I do, if anything, to get a friends with benefits going per say?
I like my best friend sexually, what do I do?
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