Should I "Accidentally" Text My Workcrush?

I (M30) have been in a five year long relationship with my GF (F25). The past couple of years our lust for each other has evaporated. We are happy and enjoy our life together. She is not open to the idea of an open relationship, which has put a bit of strain on my mind.

I work at a department house like Lowes and recently i have gotten a new female colleague in the cash registry. She is 4' 11" and F22. When arriving to work she wears sheer top without a bra. This meaning her young perky tits are litterally pointing at me. We had a conversation for 10 minutes i just couldnt stop staring, every time i glanced op at her small face with cute nerdy glasses, she would make a move to get my attention towards her tits again. I think she enjoys the attention as she is a bit bratty by nature. She hugs me every time we see each other.

I would like to accidentally text her my fantasy about having her sit on my face and grind until she comes again and again. But i dont know how that would affect my relationship with her, even though i would take the message back and stating that it was intend for my girlfriend.