Y'all ain't friends..........you guys are choosing to hide under the guise of "platonic friendship" when in truth all that is present is repressed sexual tension and curiousity. You're far from the first and far from the last of men and women who are so petrified of acknowledging their own feelings that we hide behind the "friends" tag. I had been guilty of it before too in the past unitl the day came that I recognized what it was and embraced it.......Having sexual feelings or even romantic feelings doesn't automatically mean that you are going to be married and live the white picket fence life. But if there is that much physical contact and time being spent together, then there are feelings there. Everybody has a choice of what they do with their time. Some might not value their time as much as others, but we all have a choice. You both actively choose to spend intimate time getting to know each other on breaks...........actions speak louder than words..................
What kind of work do you do?....and yes your timing was atrocious. Why make a move on the job regardless of the feelings in the air? Only way you should be kissing her is if you guys were already smashing.......
Now this is all under the assumption that the chemistry is there and going by your story it is.......but if it isn't. Well you are being used for a twisted game of validation from her part, an extreme case of the work husband. I doubt it though.
Simple question, have you guys not spent time together hanging out after work? That right there is the simple litmus test. You guys should actually go out on a date (but it seems you guys will have to phrase it in terms of "hanging out" instead of what it is...

.), feel each other out. See how you guys get along outside of the forced interaction of the work environment.
She's talking about "sloppy thirds", but little do you know she has made her mind up. I say this to dudes all the time, why would a woman who is repulsed by you and have no interest in you physically be in a need to inquire about your sex life? If it was not on her mind on in consideration there would be no reason for the convo to veer into those directions.......
But I will say you may have fumbled the ball by the way you talk about your multiple partners. If you talk about the other girls you are fukking and it appears as if they are simply disposable, then she will not want to feel just as disposable. There is a way to let a woman know you have more partners without it coming across as sleazy. At heart no girl wants to feel like a cum receptacle.
Does she know you know about her OnlyFans?....Would be interesting to see how she feels about that...
Also huge caveat: How much do you value your job? Because if this goes south there will be reverberations