There's this girl at work who I am totally into.
N.B: I'm not interested in comments about whether I should be dating girls at work. I date them all the time. It has only helped me further my career in all places I've worked. Plus there are other threads discussing such things.
OK. She's cute for sure, has a smoking hot body and dresses in a style I like and that compliments my own.
We got talking at a recent works piss-up (I organise these events) and discovered we both love David Lynch (surrealist director), Richard Dawkins (evolutionary biologist) and Studio Ghibly (japanese animation producers). Since then we have discovered that we are both passionate about soooo many of the same things.
She is totally into me too. Her BL is all IOIs, laughs at all my jokes even the crappy / cheesy ones, she comes over to talk to me all the time even though her work is timed (due to my position I am free to roam / chill whenever so this doesn't interfere with my work).
The problem is she has a fiancé. I know a lot of PU guys don't give a shit about such things. Well, I do. I am not about to fuck around with a girl with a partner.
However, I really like this one. I don't want to interfere with her relationship, just make sure she knows that there is a better option out there. The rest is up to her.
So my question is ... What steps can I take to continue growing our relationship, so that she starts to question if she should be with this guy or try a slice of kowalski pie instead

, without actually making a move on her?